For_____new or existing buildings, solar water heating is the most cost-effectiv

游客2025-06-18 11

问题 For_____new or existing buildings, solar water heating is the most cost-effective way to reduce your fuel bills.

选项 A、neither
B、nor
C、or
D、either

答案 D

解析应当选择与or搭配使用的either。

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