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问题

Why is the classroom so dirty?——Sorry, Sir. It _____ yesterday. We forgot to do it.

A:doesn't clean
B:didn't clean
C:isn't cleaned
D:wasn't cleaned
正确答案是:
标签: classroom , so , why
同类题型

Peter dosen’t tell me when he _______ , I will tell you as soon as he ________.

Will you get there by ______ train.–No, I will take ______ taxi.

Dear me! What a wonderful computer! —My grandpa bought it for my sister and me. It’s ______.

A brilliant idea occurred to him, to his research in the lab.

We all _______our faces, so people don’t know us.

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