单项选择题

It is time that the government ______ measures to protect the rare birds and animals.

A.takes
B.took
C.has taken
D.taking

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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

单项选择题

Without electronic computers, much of today’s advanced technology ______.

A.will not have been achieved
B.have not been achieved
C.would not have been achieved
D.had not been achieved

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