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Eg: The research is so designed that once_____ nothing can be done to change it.A begins B
having begun C begining D begun. Why choose D?
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推荐答案 2013-04-20
原因是横线上本来是一个省略句,句子本身是【once it's begun】一旦研究被开始
由于主语是it+be+过去分词的形式,因此可以省略剩下过去分词【begun】
翻译:这项研究设定好了,一旦开始任何事情都不能去改变它。
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The
research
is
so
designed
that
once
___
nothing
can
be
done
to
...
答:
当
once
(或when, while, if, as if, though/although, as, until, until, whether, unless, since等)引导状语从句时,若从句中的主语与主句中的主语相同(或从句中的主语为it), 且从句的谓语中有be时,可省略从句中的主语和be, 而只保留形容词??分词??动词不定式??介词短语等,故答案为D??
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