—Didn't the teacher see him entering the classroom?    
—No, he_______ on the blackboard.
A．was writingB．had written
C．wroteD．is writing
A。
本題考察時態(tài)。過去進行時表示過去某一時間正在進行的動作，有延續(xù)、進行的特征。由題意知，該老師在他進來時正在寫字，故選A。
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