单项选择题

You ______ her at the beginning, but now it is too late.

A．ought to refuse
B．have ought to refuse
C．ought to have refused
D．ought have refused
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单项选择题
By the end of this month, we surely ______ a satisfactory solution to the problem.
A．have found
B．will be finding
C．will have found
D．are finding
单项选择题
(I'd rather) you (would go) by train, because I can't (bear) the idea of (your being) in an airplane in such bad weather.
A．I'd rather
B．would go
C．bear
D．your being
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