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

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（） the absence of the Manager Mr. Smith is in charge of the business.

A．In
B．At
C．To
D．With
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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