单项选择题

For some serious coin collectors, a coin with a different date, mintmark, and even a little ______ in design is counted as a different coin.

A．contrast
B．diversity
C．variation
D．variety
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The unrighteous officer prefers to resign ______ part in such dishonest business deals.
A．than take
B．than to take
C．rather than take
D．rather than to take
单项选择题
You should know better than ______ the risk of gambling.
A．to run
B．running
C．to have run
D．ran
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