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-----What do you think makes him so sad?

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-----What do you think makes him so sad?
-----______ in the first round of the competition,I suppose.
A.as he was beaten
B.being beaten
C.beaten
请详细分析每个选项,为什么不选A、C,为什么选B.
A.as he was beaten 通常不用来回答为什么.
B.being beaten ...是动名词做主语,正好回答了问句的what.它是对的.
C.beaten ...是过去分词短语,不能做主语,与问句的what无法相一致.故错