单项选择题

I opened a letter and it contained______

A．a important information
B．an important information
C．the important information
D．important information
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单项选择题
—May I. use your pen, please—Sure.
A．Go ahead
B．Don't mention it
C．Certainly not
D．Not at all
单项选择题
Try the experiment yourself ______you will know the reason.
A．so
B．and
C．or
D．unless
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