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【原创】 Green roofs have an ______effect, helping reduce the amount of energy______ to heat a building in winter and cool it in summer.

A.isolated;needed B.isolating;needed
C.isolated; needed D.isolating;needing
科目 英语   题型 单选题   难度 中等
知识点: 形容词的宾语从句 谓语
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