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

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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

单项选择题

—Will you be able to finish the job this week —______.

A. I can't say it
B. I don't know that
C. I'm not sure this
D. I don't expect so

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