烟台开发区五小作业多:15) ____ with the size of the whole earth, the highest mountain does not seem high at all.

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15) ____ with the size of the whole earth, the highest mountain does not seem high at all.
A) When compared B) While comparing C) Compare D) Comparing
怎么做啊,要解释的

a
这句话的主语是mountain,它是被compare的,要用被动语态,所以bcd都不对,只有a是被动语态,里面省略了主语及be动词

A,When后省略了it is

A,When后省略了it is