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

試題分析: 句意：當她在看電視時，有人敲門。knock at 敲門；while當……的時候，引導(dǎo)的時間狀語從句動詞為延續(xù)性動詞，進行時態(tài)，與主句同時發(fā)生，故選B
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