【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 |
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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 |
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