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     the sentence , so he asked the teacher to explain it again.

A.Not having understoodB.As he didn’t understand
C.Having not understoodD.He didn’t understand

D

解析试题分析:句意:他不理解这个句子,所以他请求老师再解释一次。选项AC都是非谓语动词,因为整个句子已经有并列连词so,所以前后应该都是句子,故排除ABC,故选D。
考点:考查连词的用法。
点评:本题难度适中。连词主要考查它们的意义及句法功能,但是它们是在一定的语言环境下而出现的,所以考生必须能正确理解句子的句意。
即学即练:I can’t come back________six o’clock perhaps. Don’t wait for me for supper.
A. after      B. if         C. until       D. when
解析:C。句意:until引导时间状语从句时常与not连用,意为“我大约直到6点才能回来”,故选C。

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