单项选择题

I'm uncertain_______ to go or not.

A.where
B.if
C.whether
D.what
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单项选择题
At board meetings you have to （）the formality of the language.

A.used to
B.be used to learn
C.get used to
D.be used as
单项选择题
They attribute their success to their teacher's_______.
A.enjoyment
B.attachment
C.encouragement
D.assignment
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