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解析一个英语单选题~~

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解析一个英语单选题~~
Once ____to the public in the newspaper,the incident will attract lots of people's attention.
A.EXPOSED B.EXPOSING C.BE EXPOSED D.TO EXPOSE
正确答案是A~~但为什么是A?be 动词还可以省略么?请详细说明这一类型的句子!
解析一个英语单选题~~
Once (the incident is) exposed to the public.
因为括号中的成分和后面的主语重复.所以我们去掉.
再举个例子:
once done it,you should pay for the price.
一旦你做了,你就要付出代价.
Once( you have) done it.