单项选择题

Nobody______ when I complained about the food, so nothing was done about it.

A．turned to me
B．relied on me
C．backed me up
D．held me up
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单项选择题
The use of money is not limited to high civilizations; actually many primitive peoples have______ moneys of their own.
A．discovered
B．devised
C．diverted
D．diversified
单项选择题
No other drug is available at present______ can produce the same therapeutic effect with less risk.
A．that
B．than
C．when
D．as
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