单项选择题

It is a question ______ the book will be published this month or next month.

A．if
B．whether
C．that
D．which
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单项选择题
I shall make the announcement ______ the beginning of the meeting.
A．to
B．for
C．at
D．in
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
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