单项选择题

Much of the debate on aging society in China has focused on the extended families ______ the number of "empty-nests" is growing by millions every year.

A．that
B．when
C．where
D．which
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单项选择题
Crimea decided to vote ______ joining Russia on March 12, which might lead to a conflict.
A．on
B．against
C．down
D．for
单项选择题
The school has made it a rule no student shall take an illegal vehicle ______ a school bus.
A．other than
B．rather than
C．or rather
D．or else
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