【題目】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】試題分析：句意：當父母們到達大廳的時候，學生們已經(jīng)完成了他們的項目。根據(jù)句意及題干分析此空發(fā)生在父母們到達之前，是“過去的過去”，所以要用過去完成時態(tài)，故選B。

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