Mary________alltheexercisesbeforeh

发布时间:2020-07-27 01:14:33

Mary ________ all the exercises before her teacher collected the exercise books.A.have finishedB.finishedC.had finishedD.finish

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C解析Mary完成作业,发生在老师手作业之前,“过去的过去”用过去完成时.
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