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【题目】When the parents arrived at the hall, the students _______ their projects.

A. have finish B. had finished

C. finished D. are finishing

【答案】B

【解析】试题分析:句意:当父母们到达大厅的时候,学生们已经完成了他们的项目。根据句意及题干分析此空发生在父母们到达之前,是过去的过去,所以要用过去完成时态,故选B

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