The research is so designed that once nothing can be done to change it. [ ] A．beginsB．having begun C．beginningD．begun 题目和参考答案——青夏教育精英家教网——

题目内容

(NMET 2002)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：

导解：此题考查的是状语从句中的省略，补充完整为“once it is begun”.

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