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
動詞不定式表示一次的動作，過去分詞表示發(fā)生過的動作，動名詞表示反復發(fā)生的動作，完成時表示發(fā)生且已完成的動作，根據(jù)題意選C，老師正貫注于寫什么東子，只是不時停下來參考一下書或其他東西。
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