单项选择题

A series of seminars ______ scheduled.

A. has
B. is
C. /
D. are
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______ air is to man, so is water to fish.
A. Like
B. As
C. Since
D. For
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______ each other for 10 years, they decided to meet this year.
A. Not having seen
B. Having not seen
C. No seeing
D. Seeing not
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