解析一个英语单选题~~Once ____to the public in the newspaper,the incident w_英语解答

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!

人气：330 ℃　时间：2020-06-27 04:34:57

解答

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....