题目内容：
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
参考答案：
选择题：Indoor heating systems have made ______ for people
- 题目分类：石家庄铁道大学-土木工程-大学英语III
- 题目类型：选择题
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A、 possible
B、 it possible
C、 possible that
D、 it is possible