The teacher was absorbed in writing something, only _____ now and then to refer to a book or another.
A．to stopB．stoppedC．stoppingD． having stopped
C
動(dòng)詞不定式表示一次的動(dòng)作，過去分詞表示發(fā)生過的動(dòng)作，動(dòng)名詞表示反復(fù)發(fā)生的動(dòng)作，完成時(shí)表示發(fā)生且已完成的動(dòng)作，根據(jù)題意選C，老師正貫注于寫什么東子，只是不時(shí)停下來參考一下書或其他東西。
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