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
She has made it clear ______ she will not take part in parties of any kind recently.
A．if
B．that
C．although
D．while
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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