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        1. —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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