If they don’t understand it the first time, over it again until they do. A. going B. to go C. gone D. go 题目和参考答案——青夏教育精英家教网—

题目内容

If they don’t understand it the first time, __________ over it again until they do.

A. going　　　　　　　　　　 B. to go　　　　　　　　　　 C. gone　　　　　　　　　　　　 D. go

答案：D
解析：

此题正确答案选D项, 其余几项均有可能被误选。横线前if引导的是一个条件状语从句, 而在横线处无论是填A、B或C项, 其后都是一个非谓语动词短语, 而不是一个句子, 这样一来, 整个句子没有主句, 从而导致结构不完整。若选D项, 则go over it again until they do则是一个句子(祈使句), 在此用作整个复合句的主句。

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