He’s______ as a" bellyacher" -- he’ s always complaining about something.

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问题 He’s______ as a" bellyacher" -- he’ s always complaining about something.

选项 A、who is known
B、whom is known
C、what is known
D、which is known

答案C

解析 what引导名词从句中作主语补足主语。
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