单项选择题

You're ______ your time trying to persuade him; he' II never help you.

A．wasting
B．losing
C．spending
D．missing
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单项选择题
Could you possibly ______ me at the next committee meeting
A．stand in for
B．make up for
C．tall back on
D．keep in with
单项选择题
D. observant
D. observant
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