单项选择题

（）I don't know much about internet, I find it is really useful.

A、 As
B、 Since
C、 If
D、 While

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单项选择题
I got caught in the rain and my clothes（）.

A、 has mined
B、 had mined
C、 has been ruined
D、 had been mined
单项选择题
—I'm sorry. I'm late. —（）, Lin.

A、 You're welcome.
B、 Go ahead.
C、 Don't mention it.
D、 No problem.
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