单项选择题

It was a long time ______ the neighbors found that the old lady had been dead of cold.

A．when
B．until
C．since
D．before
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单项选择题
Even if you had refused, the ______ would probably not have been very different.
A．effect
B．consequence
C．result
D．outcome
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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