单项选择题

（）the cause, they were able to propose to a remedy.

A．Found
B．Having found
C．Have found
D．Having been found

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单项选择题

Never（）Josh met such a complicated situation.

A．did
B．could
C．will
D．had

单项选择题

Jerry seldom came to the laboratory,（）he

A．did
B．didn't
C．does
D．doesn't

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