单项选择题

______ such heavy pollution already ,it may now be too late to clean up the river.

A．Having suffered
B．Suffering
C．To suffer
D．Suffered
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单项选择题
—I'm taking my driving test tomorrow. —______!
A．Cheers
B．Good luck
C．Come on
D．Congratulations
单项选择题
Whom is it up to______ the matter
A．decide
B．to decide
C．deciding
D．decided
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