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________ you ought to do now is to see a doctor at once.

A.How B.That C.Which D.What

D

解析试题分析:考查主语从句:句意:你应该做的是立刻看医生。Is前面是主语从句,缺少宾语,用what引导主语从句,how怎么(表示方式,不能做宾语),that引导主语从句的时候,不做成分,which哪个(不符合句意),选D。
考点:考查主语从句

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