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20.______ the classroom,the teacher found the students ______,so he was very angry.(  )
A.Step into; talkingB.Stepping into; talking
C.Entering; talkedD.Enter; talked

分析 走进教室时,老师发现学生们在说话,因此他很生气.

解答 答案是B.本题考查非谓语动词的用法;题干第一空需要的是分词做时间状语,排除A和D;the teacher和enter/step into之间是主动关系,所以第一空用现在分词;第二空需要的是宾语the students是补足语,talk和宾语之间是主动关系,故用现在分词,答案选B.

点评 首先判断选项中的动词在句中是以谓语还是非谓语形式出现,然后根据选项在句中的功能结合非谓语的基本用法做出合理的判断.

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