Peter________hishomeworkwhenRos

发布时间：2020-07-28 12:51:38

Peter ________ his homework when Rose went to get her book she ________ in his room．A.did; had leftB.was doing; had leftC.had done; leftD.had done; was leaving

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B解析when 在句中意思是at the same time，所以前面的句子是过去进行时，而后面句子中动作是在去拿书之前发生，故用过去完成时。
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