D
因为问句有cleaned,是一般过去式,所以答句也应该是一般过去式,所以排除B和C.
又因为是用Who开头的疑问句,即特殊疑问句,不能用yes和no来回答（用yes和no来回答的是一般疑问句）,所以排除A
只能选D
Who cleaned the classroom?怎么回答
3个回答
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