单项选择题

You ______ be tired after such a long journey.

A．must
B．should
C．can
D．have to
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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
单项选择题
Do you agree that power is ______ makes things work
A．nothing
B．anything
C．what
D．that
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