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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:

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,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是一个句子(祈使句),在此用作整个复合句的主句。


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