an amount of
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an amount of和amounts of的区别
an amount of后接可数名词。amounts of后面可以接可数也可以接不可数名词。an amount of谓语动词用单数，amounts of谓语动词...
TAG：an amount of 相关文章
an amount of后接可数名词。amounts of后面可以接可数也可以接不可数名词。an amount of谓语动词用单数，amounts of谓语动词...