题目内容

—Didn't the teacher see him entering the classroom?    
—No, he_______ on the blackboard.
A．was writingB．had written
C．wroteD．is writing
A。
本题考察时态。过去进行时表示过去某一时间正在进行的动作，有延续、进行的特征。由题意知，该老师在他进来时正在写字，故选A。
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