单项选择题

Someone could have been killed.The traffic lights （）repaired a lot sooner.

A.must be
B.must have
C.should be
D.should have been

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I'm uncertain_______ to go or not.
A.where
B.if
C.whether
D.what
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
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