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—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
B
考查固定用法。used to do,过去常常,现在已不再如此;be used to do sth.被用于做某事;be used to doing sth.习惯于做某事。根据句意,应是火被用来取暖。所以选B。
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