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
______he'll come to the meeting isn't clear.
A) If
B) That
C) Whether
D) Why
单项选择题
I don't believe you are wrong,______
A) do they
B) aren' t they
C) are you
D) don' t they
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