.The researcher is so designed that once ________ nothing ca

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.The researcher is so designed that once ________ nothing can be done to change it
A.begins B.having begun D.beginning D.begun

D.
此题是2002年全国高考卷里的一道题,考查过去分词的用法.有人早就解释过了.我也再做点解释.
在 so ...that ...结果状语从句里面,once begun 是过去分词作状语,相当于状语从句 once it is begun,“一旦它被启动了,被开始了”.所以,begun 是过去分词作状语,正确答案选 D.
再问： it is 做句子成分时可以不遵循主从句主语一致的原则吧！？
再答：一般还是遵循主从句主语一直原则的，这里的 it 指前面主句的主语 the reasearcher。有时也有差异。例如：If ( it is ) possible, we will do it tomorrow. If (it is) necessary, I will do it.

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