-Fire is very useful to human! -Yes, especially in winter a fire warm.A．used to keepB．can be used to keep C．is used to keepingD．was used to keeping 题目和参考答案——青夏教育精英家教网——

题目内容

—Fire is very useful to human!
—Yes, especially in winter a fire _____________warm.

A．used to keep	B．can be used to keep
C．is used to keeping	D．was used to keeping

B解析:
略

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