题目内容
---Why is the classroom so dirty?
--- Sorry, sir. It ______ yesterday. We forgot to do it.
--- 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 |
D
根据yesterday,可知本题考查的是一般过去时的被动语态,故选D
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