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

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单项选择题

One of the students hasn't prepared ______ lessons very well.

A．his
B．one's
C．ones
D．their

单项选择题

You'll have to spend ______ whiting your report here.

A．one day or two days
B．one day or two
C．a day or two
D．two days or one

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