---Why is the classroom so dirty? 
--- Sorry, sir. It ______ yesterday. We forgot to do it.
A．doesn’t cleanB．didn’t cleanC．isn’t cleanedD．wasn’t cleaned
D
根據(jù)yesterday，可知本題考查的是一般過(guò)去時(shí)的被動(dòng)語(yǔ)態(tài)，故選D
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