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
Though I haven't seen him for years, I can （）his voice on the telephone.

A. realize
B. discover
C. accept
D. recognize
单项选择题
In （）century, computers will be used more widely.

A. twenty-one
B. the twenty-one
C. twenty-fast
D. the twenty-first
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