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
When he was in his ______, he began to study English.()

A. forty
B. forty's
C. forties
D. forty's years old
单项选择题
In no way ______ from practice.()

A. theory can be separated
B. theory is separated
C. can theory be separated
D. has theory been separated
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