We’ ve just installed central heating,______should make a tremendous difference to the house next winter.

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问题 We’ ve just installed central heating,______should make a tremendous difference to the house next winter.

选项 A、what
B、it
C、that
D、which

答案D

解析 这是个非限制性定语从句,用关系代词which引导,指代前面安装中央暖气系统这个事件。
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