单项选择题

Never ______ seen so many people cooperating in such an event.

A．is the world
B．has the world
C．the world is
D．the world has
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单项选择题
The leaders met to discuss the problems facing their ______ countries.
A．respective
B．respected
C．respectable
D．respectful
单项选择题
It is important that she ______ in an appropriate position.
A．placed
B．be placing
C．places
D．be placed
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