单项选择题

He is expected Lo make a speech this afternoon, ______

A．is he not
B．isn't he
C．is not he
D．isn't it
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单项选择题
Many foreigners ______ the Great Wall as the World's Seventh Wonder;
A．look at
B．look for
C．look around
D．look on
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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