WhileJim______thefloor,someone_____

发布时间：2020-07-25 21:06:27

While Jim ______the floor, someone ______at the doorA.was sweeping, was knockingB.was sweeping, knockedC.swept ,was knockingD.swept, knocked

网友回答

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
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