单项选择题

The president ______ a rise in salary for ages, but nothing has happened yet.

A．promised
B．is promised
C．has been promising
D．is promising
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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．that
B．when
C．and
D．where
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
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