初中英语The student _their classroom whThe student _their classroom when the visitors arrived.A.have cleaned B.had cleaned C.was cleaned D.have been cleaned
问题描述：
初中英语The student _their classroom wh
The student _their classroom when the visitors arrived.A.have cleaned B.had cleaned C.was cleaned D.have been cleaned
答
B
动作发生在ARRIVED 之前，故用过去完成时。
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答
B 当来访者到来时,学生们已经打扫玩教室