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        1. When the teacher came in, all of us _______.

          A.stopped talking B.stopped to talk C.stop talking D.stop to talk

          A

          解析試題分析:句意是:當老師進來時我們都停止了說話。根據(jù)賓語從句時態(tài)一致原則,所以stop用過去式;stop to do是開始做正在做的之外的事的意思,stop doing 是停止正在做事情。根據(jù)句意是停止不說話了,故選A。
          考點:考查動詞時態(tài)和非謂語動詞。

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