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【题目】By the time I walked into class, the teacher ________ the lesson already.

A. had started B. starts C. start D. was started

【答案】A

【解析】

句意:当我走进教室时,老师已经开始上课了。A. had started过去完成时;B. starts动词三单式,一般现在时;C. start动词原形,一般现在时;D. was started一般过去时态的被动语态。start这一动词发生在走进教室之前,walkedwalk的过去式,表示“动作过去的过去”要用过去完成时,故答案选A。

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