The students _____B____ their classroom when the visitors arrived.
A .have cleaned B.had cleaned C.was cleaned D.have been cleaned
因为B,首先这是过去式,所以不用A,D,当访问者到达时,学生已经打扫干净教室了.已经表示过去完成式,所以B,或者把C该一下,变成was cleaning也行,意思就是当访问者到达时,学生正在清扫教室.过去进行时
问一道英语问题The students _________ their classroom when the visit
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