________ is no doubt that using energy efficiently reduces the release of greenhouse gases.
A It        B This       C That     D There
D
考查句型：there is no doubt that毫無(wú)疑問(wèn)做某事。句意：毫無(wú)疑問(wèn)有效地使用能源會(huì)減少溫室氣體的釋放。故選D。
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