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英语语法,非谓语动词上的问题whenaskedtocomparetheeducationsystemsofchinaandbritain,theprofessorgavehisowncomment这里为什么要用“askedtocompare”而不是“askedhimtocompare”?

题目详情
英语语法,非谓语动词上的问题
when asked to compare the education systems of china and britain,the professor gave his own comment
这里为什么要用“asked to compare”而不是“asked him to compare”?
▼优质解答
答案和解析
when (he was) asked to compare the education systems of china and Britain,the professor gave his own comment.
省略了he was