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—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(shí)態(tài)。過去進(jìn)行時(shí)表示過去某一時(shí)間正在進(jìn)行的動(dòng)作，有延續(xù)、進(jìn)行的特征。由題意知，該老師在他進(jìn)來時(shí)正在寫字，故選A。
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