单项选择题

______ a fine day, we decided to go out on a picnic.

A．Been
B．Being
C．It was
D．It being
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单项选择题
Modern medicine and new methods of food production allow adults to live longer and babies to ______ , not die soon after birth.
A．survive
B．grow up
C．exist
D．develop
单项选择题
The key ______ good health is to eat and sleep regularly.
A．to
B．for
C．of
D．in
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