-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 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

【答案】

B

【解析】略

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