单项选择题

It was not until he entered the classroom ______ he realized that he had forgotten to do the homework.

A．before
B．when
C．then
D．that
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单项选择题
As the clouds drifted away an even higher peak became ______ to the climbers.
A．in sight
B．visible
C．obvious
D．apparent
单项选择题
Mary is a conscientious student; she works very hard and is ______ to her teachers.
A．respected
B．respectable
C．respectful
D．respective
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