The students have cleaned the classroom,_______?A.so they B.don't C.have they D.haven't they

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The students have cleaned the classroom,_______?A.so they B.don't C.have they D.haven't they
The students have cleaned the classroom,_______?
A.so they B.don't C.have they D.haven't they

The students have cleaned the classroom,_______?A.so they B.don't C.have they D.haven't they
这种叫反义问句,也要附加疑问句（Tag question)
一般是前否后肯,前肯后否.
尾句助动词根据前句决定.
这题的答案是D
前句有助动词：have
前句是肯定的,所以用haven't
主语是students,所以用they

1、要想成为一名总统或总裁，必须在选举的时候获得大量选票。（是被选，所以选C）
2、能被邀请到这里讲座，我感到很荣幸。（被邀请，而不是请求，所以选B）

D选项，cleaned是过去式，说明整个句子用过去时，选项中只有D是过去式

1、要想成为一名总统或总裁，必须在选举的时候获得大量选票。（是被选，所以选C）
2、能被邀请到这里讲座，我感到很荣幸。（被邀请，而不是请求，所以选B）
以上回答你满意么？

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