interest作利息时可数吗?牛津词典写的不可数 但是在某题目里看到这样一个句子:If she was willing to pay an interest of 20%,she can borrow money from him.

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interest作利息时可数吗?牛津词典写的不可数 但是在某题目里看到这样一个句子:If she was willing to pay an interest of 20%,she can borrow money from him.
interest作利息时可数吗?
牛津词典写的不可数 但是在某题目里看到这样一个句子:If she was willing to pay an interest of 20%,she can borrow money from him.

interest作利息时可数吗?牛津词典写的不可数 但是在某题目里看到这样一个句子:If she was willing to pay an interest of 20%,she can borrow money from him.
interesti做“利息”的意思时,是不可数名词.但本题是pay an interest of 20% 是个固定用法.当某些不可数名词后带of结构时,做可数名词用.再如:have a good understanding of sb 对某人有个更好的了解.(这里的understanding也是不可数名词)