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—Whyistheclassroomsodirty?—Sorry,sir. It       yesterda...

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—Whyistheclassroomsodirty?—Sorry,sir. It       yesterda...

—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


【回答】

D

知識點:動詞語態

題型:選擇題