单项选择题

It was not until she had arrived home ______ she remembered her appointment with the doctor.

A．that
B．when
C．and
D．where
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单项选择题
（） , a TV set is in use in every home for about six hours each day.

A．It is average
B．The average that
C．On the average
D．On average
单项选择题
The mail was ______ for a week because of the flood.
A．held in
B．hold on
C．hold off
D．hold down
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