The teacher was absorbed in writing something, only _____ now and then to refer
题型：不详难度：来源：
The teacher was absorbed in writing something, only _____ now and then to refer to a book or another. | A．to stop | B．stopped | C．stopping | D． having stopped |
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答案
| C |
解析
| 动词不定式表示一次的动作，过去分词表示发生过的动作，动名词表示反复发生的动作，完成时表示发生且已完成的动作，根据题意选C，老师正贯注于写什么东子，只是不时停下来参考一下书或其他东西。 |
举一反三
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