单项选择题

Without the air to hold some of the sun’s heat, the earth would be ( ) on at night.

A．very cold for us to live
B．so cold to us living
C．too cold for us to live
D．rather cold of us live
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单项选择题
It was not until she had arrived home ( ) she remembered her appointment with the doctor.
A．when
B．that
C．and
D．where
单项选择题
You can stay here ( ) you keep quiet.
A．as long as
B．unless
C．in case
D．in order
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