单项选择题

No sooner had we reached the top of the mountain ______ we all sat down to rest.

A. when



B. then
C. than



D. until
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单项选择题
He is only too ready to help others, seldom,（）, refusing them when they turn to him.

A.if never
B.if ever
C.if not
D.if any
单项选择题
（）the temperature might drop, coal was prepared for warming.

A. To consider
B. Considered
C. Considering
D. To be considered
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