单项选择题

A long line of traffic had to wait at the ______ until the train had passed.

A．crossroads
B．junction
C．level-crossing
D．bridge
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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
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
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