( )with the size of the whole earth,the highest mountain does not seem high at all. A when compared B compare C while comparing D comparing 这道题选A,我知道是省略了主谓,应该是when the highest mountain is compared 我想问是什么情况可以主谓省略,有什么说法,或是因为连词的原因,这道题是不是可以用compared也对呢?
当分句是由when和if 引导的时间状语从句和条件状语从句时,而且从句的主语也与主句的主语一致,从句的助动词为be时,才能省略主谓.比如: When seen from the top of hill, the car is as small as a match box. 分句就把”it is ”省略了