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英语
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The project is designed in this way and once____,nothing can be done to change it.
A.start
B.starting
C.started
D.having started
为什么是C? once started是固定用法吗?
人气：180 ℃ 时间：2020-04-03 07:00:07
解答
once是一旦
而且是省略句!once it is started!由于主语相同,所以省略主语和谓语!
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