you ought to do now is to see a doctor at once.A．How B．That C．Which D．What 题目和参考答案——青夏教育精英家教网—

题目内容

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

A．How

B．That

C．Which

D．What

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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