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问题: choose the best answer

American people spend ( )$500 million on dog food.
A.much B.many C.as much as D.as many as
(请说明一下为什么选!)

解答:

此英语题考察的是many和much的用法,通过理解,它的意思是说和500million一样多,用as……as的形式,钱是不可数名词,因此用as much as