(經(jīng)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:

本題考查的是在狀語從句中的省略。once引導的是一個條件狀語從句。當從句主語與主句主語一致,從句中謂語是be或者從句中主語是it,謂語是be的時候,可以將從句中的主語與be一起省略。D項前省略了it is,所以此題應選擇D項。


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