单项选择题

______ is human nature, that people don't cherish the things they have until they lose it.

A．It
B．Such
C．That
D．This
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单项选择题
Our country had made great efforts to promote the family-planning policy, but ______ the birth rate is getting higher and higher.
A．as it were
B．as it is
C．as it was
D．as is it
单项选择题
The activities of each day, ____ visiting the famous places of interest or anticipating the traditional party of local people, went quite smoothly.
A．it being
B．be it
C．was it
D．it was
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