单项选择题

You're () your time trying to persuade him; he'll never join us.

A．spending
B．wasting
C．losing
D．missing

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单项选择题
A computer()think for itself. It must be told what to do.

A．can't
B．couldn't
C．may not
D．might not
单项选择题
I'd been expecting()letters the whole morning, but there weren't () for me.

A．some; one
B．many; a few
C．some; any
D．a few; none
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