单项选择题

______some of this juice — perhaps you'll like it.

A．Trying
B．Try
C．To try
D．Have tried
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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
单项选择题
—I'm taking my driving test tomorrow. —______!
A．Cheers
B．Good luck
C．Come on
D．Congratulations
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