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
You()yesterday if you were really serious about your work.

A. ought to have come
B. ought have come
C. would come
D. ought to be coming
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
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