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

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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
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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
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

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
B 当来访者到来时,学生们已经打扫玩教室

B
动作发生在ARRIVED 之前,故用过去完成时。
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