单项选择题

Volcanoes (火山)（）as active, dormant and extinct.

A．described
B．are described
C．being
D．which are described

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单项选择题
I would have come sooner but I（）that you were waiting.

A．wouldn' t know
B．didn' t know
C．haven' t known
D．don' t know
单项选择题
When you come to Beijing, I can put you（）for the night.

A．up
B．down
C．in
D．out
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