单项选择题

I shall make the announcement ______ the beginning of the meeting.

A．to
B．for
C．at
D．in
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单项选择题
In ______ century, computers will be used more widely.
A．twenty-one
B．the twenty-one
C．twenty-first
D．the twenty-first
单项选择题
I think he studies very hard, ______
A．does he
B．doesn"t he
C．don"tI
D．do I
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