I_____in this room watching television when someone_____on the door.<br> <br>A、sat…knocked<br>B、sat …was knocking<br>C、was sitting …knocked

I_____in this room watching television when someone_____on the door.

A、sat…knocked
B、sat …was knocking
C、was sitting …knocked

出自：国家开放大学网络实用技术基础

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