题目内容

While she _____ TV, someone _______ at the door.
A．watch, knockedB．was watching, knocked
C．watching, knockingD．was watching, is knocking
B

试题分析: 句意：当她在看电视时，有人敲门。knock at 敲门；while当……的时候，引导的时间状语从句动词为延续性动词，进行时态，与主句同时发生，故选B
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