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
【正确答案】
C
【答案解析】
be known as为固定搭配,意为“被称为,以……著称”。此处用what指代“bellyacher”,并引导表语从句。
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