While Jim the floor, someone at the door. A．was sweeping, was knocking B．was sweeping, knocked C．swept ,was knocking D．swept, knocked 题目和参考答案——青夏教育精英家教网——

题目内容

While Jim ______the floor, someone ______at the door.

A．was sweeping, was knocking	B．was sweeping, knocked
C．swept ,was knocking	D．swept, knocked

【答案】

B

【解析】while引导的从句一般用进行时态，而主句为一般时态，故选答案为B

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【小题1】That old printer doesn’t print as__________(quick) as this new one.
【小题2】It’s ________ (meaningful) experience I have ever had. I’ll never forget it.
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【小题8】—What's wrong with your TV set？ —The picture_________ (not come) out yet．
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