单项选择题

I'm afraid I can't see you this afternoon, because I ______ tennis with Frank.

A．would be playing
B．would play
C．will have Been playing
D．am playing
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单项选择题
It took western companies many years to ______ from the oil crisis of the mid-70s.
A．regain
B．recover
C．retain
D．refresh
单项选择题
Jack is always late for appointments. He seems to be ______ of leaving the house on time.
A．unable
B．impossible
C．incapable
D．unaware
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