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(经典回放)The research is so designed that once ________ nothing can be done to change it.

[  ]
A.

begins

B.

having begun

C.

beginning

D.

begun

答案:D
解析:

本题考查的是在状语从句中的省略。once引导的是一个条件状语从句。当从句主语与主句主语一致,从句中谓语是be或者从句中主语是it,谓语是be的时候,可以将从句中的主语与be一起省略。D项前省略了it is,所以此题应选择D项。


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