Indoor heating systems have made ______ for people to live and work comfortably in a mild climate. A、 possible B、 it possible C、 possible that D、 it is possible

Indoor heating systems have made ______ for people to live and work comfortably in a mild climate.
A、 possible
B、 it possible
C、 possible that
D、 it is possible

出自：石家庄铁道大学-土木工程-大学英语III

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