---Whyistheclassroomsodirty?---Sorry,Sir.

发布时间:2020-08-05 14:24:01

---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

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D解析本句子考察的是一般过去时的被动态,其结构主语+was/were+动词过去分词,根据中的yesterday,可推知。
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