不可数名词：例river is clear还是river are clear?
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不可数名词：例riverisclear还是riverareclear?不可数名词：例riverisclear还是riverareclear?不可数名词：例riverisclear还是riverarec
不可数名词：例river is clear还是river are clear?
不可数名词：例river is clear还是river are clear?
不可数名词：例river is clear还是river are clear?
river是可数的,river is clear～如果是rivers用are
ps:water是不可数的,用is