单项选择题

I ______ get this done immediately or it will be too late.

A．must
B．can
C．may
D．might
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单项选择题
You ought to take every ______ of improving your English.
A．time
B．thing
C．chance
D．case
单项选择题
He was very busy yesterday; otherwise he ______ to the meeting.
A．would have come
B．would come
C．could come
D．had come
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