单项选择题

I think it's high time we（）measures to protect the environment

A．took
B．will take
C．take
D．have taken

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单项选择题
Mary has got a full mark in the test. She（）very hard all the time.

A．will work
B．must have worked
C．may work
D．could have worked
单项选择题
The student is different（）all the students I have seen.

A．on
B．among
C．with
D．from
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