——Why is the classroom so dirty?——Sorry, Sir. It _____ yesterday. We forgot to d
题型：不详难度：来源：
——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 |
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答案
| 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。 |
举一反三
Mr. and Mrs. Black ______ back _________.| A．hasn’t come, yet | | B．haven’t come , yet | | C．haven’t come， already | | D．hasn’t come , already |
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------- _______ you _______ the book ______ to the library yet.
------ Yes. I have.| A．Have ，returned，/ | | B．Have， returned， back | | C．Did return ，/ | | D．Did， return，back |
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There ______ great changes in our hometown in the past fifteen years.| A．has been | B．have been | C．was | D．were |
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---I called you yesterday evening, but there was no answer.
----- Oh, I’m sorry. I _____ dinner at a restaurant at that time.| A．have | B．had | C．was having | D．have had |
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What_____just now?| A．did he happen | B．did happen to him | | C．happen to him | D．happened to him |
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