单项选择题

Endless mysteries are solved every year by______.

A．detectives who like Hausman
B．detectives like Hausman
C．other kinds of detectives who like Hausmam
D．detectives Dr. Hausman likes
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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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______ 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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