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
The prisoner （） this way, for here are his footprints.

A. should have escaped
B. should escape
C. must have escaped
D. must escape
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