Which sentence uses the present perfect continuous tense correctly?

Correct Answer: A

Rationale: Option A, 'I have been working on this project since morning,' uses the present perfect continuous tense correctly. This structure implies an action that started in the past (working on the project) and is still ongoing up to the present moment. Choice B is incorrect as it uses the present perfect tense ('has finished'), which indicates a completed action with relevance to the present. Choice C uses the future continuous tense ('will be leaving'), and Choice D uses the past perfect continuous tense ('had been living'). Therefore, only Choice A fits the criteria for the present perfect continuous tense.

Correct Answer: B

Rationale: The phrase 'a drop in the bucket' is an idiom that means a very small or insignificant amount in comparison to a much larger total. In this context, 'bucket' symbolizes a large quantity, emphasizing the idea that the 'drop' is minimal or inconsequential when considering the overall amount. Choice A, 'A literal container,' is incorrect as 'bucket' in this phrase is not meant to be taken literally but rather symbolically. Choice C, 'A specific goal,' is incorrect as the phrase does not refer to achieving a specific target. Choice D, 'An obstacle,' is incorrect as 'bucket' is not presented as a hindrance or barrier in this idiom.

Correct Answer: B

Rationale: In the sentence, 'He was bewildered by the unexpected turn of events,' the word 'bewildered' means confused, which is the most suitable choice to convey the feeling caused by unexpected events. 'Elated' means joyful, 'vindicated' means justified, and 'apathetic' means uninterested, making them less fitting in the context of being surprised or thrown off by unexpected events.

Correct Answer: C

Rationale: The correct answer is C. The idiom 'to cross that bridge when we come to it' means to deal with challenges as they arise, not worrying about them prematurely. It suggests addressing problems when they actually occur rather than stressing over potential issues in advance. Choice A, 'To deal with a problem immediately,' is incorrect because the idiom is about not addressing problems prematurely. Choice B, 'To plan for the future in detail,' is incorrect as it goes against the essence of the idiom, which is about dealing with issues when they happen, not planning extensively in advance. Choice D, 'To avoid difficult situations,' is incorrect as the idiom implies facing challenges when they present themselves rather than avoiding them.

Correct Answer: B

Rationale: The correct answer is 'B: 'that won the award.' A relative clause provides additional information about a noun in the sentence. In this case, 'that won the award' is the relative clause specifying which book out of all books is being referred to. It is essential to recognize and understand relative clauses for better comprehension of sentence structures. Choice A ('The book') is the main noun phrase and not a relative clause. Choice C ('was a bestseller') is the main clause of the sentence, not a relative clause. Choice D ('award') is a noun but not a relative clause as it does not provide additional information about a noun in the sentence.