While Jim ______the floor, someone ______at the door.
A．was sweeping, was knockingB．was sweeping, knocked
C．swept ,was knockingD．swept, knocked
B
while引導(dǎo)的從句一般用進(jìn)行時(shí)態(tài)，而主句為一般時(shí)態(tài)，故選答案為B
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