单项选择题

You have to go to work on Sundays often, ______

A．doesn't he
B．don't you
C．mustn't you
D．haven't you
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单项选择题
When ______ with a strong enemy, they had always retreated.
A．being faced
B．facing
C．faced
D．being facing
单项选择题
New ways have been found to prevent the river______.
A．not to be polluted
B．against polluting
C．from polluting
D．from being polluted
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