单项选择题

There must be ____________ reason for what he has done.

A．some
B．any
C．one
D．one useful
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单项选择题
—Well, I must be off now. I have an important meeting to attend.—Can we ____________ for another interview
A．go
B．fix a time
C．make a time
D．prepare
单项选择题
I prefer black shirts ____________ blue ones.
A．for
B．to
C．than
D．at
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