----Look!Someone ___the classroom.----Well!It wasn't me.I didn't do it.A.is cleaning B.was cleaning C.has cleaned D.had
问题描述：
----Look!Someone ___the classroom.----Well!It wasn't me.I didn't do it.A.is cleaning B.was cleaning C.has cleaned D.had cleaned 答案选择D,为什么不选择A,
答
肯定不能选A,从后面的答句看出教师已经被打扫了,是完成时态我还有一个问题The celebration is to begin at 9:00a.m,but we would put off our plan ___a sudden storm. A.was there B.there was C.should there be D.there should be答案是C，为什么呀The other children jumped into the swimming pool quickly ,but this___Lucy's first experience,she went into it with care after much wavering. A.was B.being C.had been D.to be答案选择B,请详细解答！谢谢！你所追问的第一个我也不太清楚但第二个应选B，因为but引导的是状语不是独立句子，因为后面有主语she谓语went into我没怎么听明白 能不能讲细点