单项选择题

When he was offered the position, he didn't know ______to accept it or not.

A．whether
B．if
C．what
D．how
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单项选择题
______, yesterday, I would have asked him not to do that.
A．Had he come
B．Provided he came
C．If he came
D．Has he come
单项选择题
He will stop showing off if no notice ______of him.
A．will be taken
B．takes
C．is taken
D．has taken
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