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
This is the only part of the country () this type of pottery can be found.

A．that
B．which
C．where
D．what
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