once completed用法和once it completed 的用法··

问题描述:

once completed用法和once it completed 的用法··
如once published ,the dictionary will be popular可以改成once it published 或者once it is published ```这句子是考查非谓语动词还是时态什么的··求详解

没有once it published 这种说法,只能说:once it is published.
once是连词引导一个时间状语从句,表示“一旦……”.
完整的说法是once it is published,the dictionary will be popular.只不过这里it is省略了.
这里考察的是时间状语从句的省略问题.