单项选择题

Man has （）been to the Moon

A. last
B. already
C. ago
D. in

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单项选择题

Jack and Lynn will （）married for thirty years tomorrow

A. have
B. be
C. become
D. have been

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Sally will send you an email to remind you （）the schedule change.

A. for
B. of
C. with
D. at

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