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引導的從句一般用進行時態(tài)，而主句為一般時態(tài)，故選答案為B

 

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