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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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
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
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