单项选择题

I can ______ your passing the exam if you are prepared for it well.

A．insure
B．assure
C．ensure
D．sure
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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
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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