【題目】I ______ TV last night when I heard knocks at the door.

A. watch B. was watching C. watched

【答案】B

【解析】

試題分析:句意:昨天晚上,我聽到敲門時,正在看電視。A. watch一般現(xiàn)在時態(tài);B. was watching過去進行時態(tài);C. watched一般過去時態(tài)。聽到敲門聲時,我正在看電視。表示一個過去動作發(fā)生時,另一個過去動作正在發(fā)生。句子用過去進行時態(tài)。故選B

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