单项选择题

It is essential that all these figures （） twice.

A. must be checked
B. be checked
C. is checked
D. will be checked

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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
I shall make the announcement（）the beginning of the meeting.

A. to
B. for
C. at
D. in
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