单项选择题

In the meantime, the question facing business is whether such research is ______ the costs.

A．worth
B．worth of
C．worthy
D．worthwhile
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单项选择题
If you ______ the bottle and cigarettes, you'll be much healthier.
A．take off
B．keep off
C．get off.
D．set off
单项选择题
The original elections were declared ______ by the former military ruler.
A．void
B．vulgar
C．surplus
D．extravagant
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