单项选择题

I cannot ______ you a good post.

A．assure
B．ensure
C．make sure
D．be sure
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单项选择题
After our computer network ______ for the third time that day, we all went home.
A．fell
B．smashed
C．collided
D．crashed
单项选择题
There's a very informative ______ on AIDS in today's paper.
A．news
B．show
C．feature
D．characteristic
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