单项选择题

Seldom __________ any mistakes during my past five years'service here.

A．would I make
B．did I make
C．I did make
D．I would make
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单项选择题
Many people favor __________ more nuclear power plants.
A．to build
B．build
C．built
D．building
单项选择题
__________ he'll come to the meeting isn't clear.
A．If
B．That
C．Whether
D．Why
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