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67.He’sasa“bellyacher”—he’salwayscomplainingaboutsomething.A.whoisknownB.whomisknownC.whatisknownD.whichisknown为什么选C不选A呢?希望能说下解体思路请不要为了财富值随便

题目详情
67.He’s ________ as a “bellyacher” — he’s always complaining about something.
A.who is known B.whom is known C.what is known D.which is known
为什么选C不选A呢?
希望能说下解体思路
请不要为了财富值随便黏贴一些毫无关系的东西过来
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答案和解析
is后边是what引导的表语从句,what在表语中做主语