—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，過去常常，現(xiàn)在已不再如此；be used to do sth.被用于做某事；be used to doing sth.習(xí)慣于做某事。根據(jù)句意，應(yīng)是火被用來取暖。所以選B。
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