单项选择题

  Another three weeks ______ necessary for us to finish the work.

A.are
B.was
C.is
D.will have been
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It is time that the government ______ measures to protect the rare birds and animals.
A.takes
B.took
C.has taken
D.taking
单项选择题
Here is a message of importance to every man and woman who ______.
A.votes
B.vote
C.have voted
D.is voted
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