Our earth is short of water.It's important to save water,but___knows how to save it.选什么?为什么A noneB not everyoneC someoneD all of ai

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Our earth is short of water.It's important to save water,but___knows how to save it.选什么?为什么A noneB not everyoneC someoneD all of ai
Our earth is short of water.It's important to save water,but___knows how to save it.选什么?为什么
A noneB not everyoneC someoneD all of ai

Our earth is short of water.It's important to save water,but___knows how to save it.选什么?为什么A noneB not everyoneC someoneD all of ai
B.
有but,是转折关系,CD就排除了,应该是肯定有人不知道怎么节约水,但是不是所有人都不知道,这个太绝对化了,而是并非每一个都知道.所以A也不行