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题目They _____ the project for three months before I joined them.A. had worked ...

题目They _____ the project for three months before I joined them.A. had worked onB. have worked onC. were working onD. worked on答案：A解析：句子中提到“before I joined them”，表示在过去某个时间点之前，因此需要使用过去完成时。选项A中的“had worked on”表示“在过去某个时间点之前已经完成”，符合句意。B选项“have worked on”表示现在完成时，不符合语境。C选项“were working on”表示过去进行时，与句意不符。D选项“worked on”表示一般过去时，也不符合语境。_____ she realized it was too late to go home.A. Not until dark didB. Until dark did notC. Dark until did notD. Did not until dark答案：A解析：该句为部分倒装句，表示“直到……才……”。在否定词“not”放在句首时，需要使用部分倒装。选项A“Not until dark did”符合部分倒装的规则，且意思与句意相符。B、C、D选项均不符合部分倒装的规则。— What do you think of the book?— It’s excellent. I _____ it since last week.A. have readB. am readingC. had readD. will read答案：A解析：对话中提到“since last week”，表示从过去某个时间开始一直持续到现在，因此需要使用现在完成时。选项A中的“have read”表示现在完成时，符合语境。B选项“am reading”表示现在进行时，不符合语境。C选项“had read”表示过去完成时，与句意不符。D选项“will read”表示将来时，也不符合语境。