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选择题()witnthesizeoftheearth,thehighhestmountaindoesntseemhighatall前面使用comparing,whencomparing,whilecomparing,compare.whencompared,选哪个

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选择题()witn the size of the earth,the highhest mountain doesnt seem high at all
前面使用comparing,when comparing,while comparing,compare.when compared,
选哪个
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答案和解析
选when compared
这里的词组是 be compared with sth.和.作比较
when引导的从句,和主句主语一致,都是the highhest mountain ,所以省略了.谓语BE也要省略.省略后剩下的是过去分词compared with sth