单项选择题

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
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单项选择题
Silver is the best conductor of electricity, copper ______ it closely.
A．followed
B．following
C．to follow
D．being followed
单项选择题
I don' t doubt ______ he will come on time.
A．whether
B．which
C．what
D．that
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