单项选择题

The water will be further polluted unless some measures ().

A.will be taken
B.are taken
C.were taken
D.had been taken

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Bob ran the 100 metres in 9.91 seconds, and I have not seen () this year.

A.the best
B.better
C.the most
D.more

单项选择题

One must keep calm in () time of danger.

A.a
B.the
C.that
D./

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