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问题: 一道英语选择题

I have one or two useful pieces of information...
I have one or two piece of useful information...
两句中useful的位置不一样,请问这两个句子哪个是正确的?

解答:

第二句,I have one or two piece (改成pieces)of useful information...
注:piece为可数名词;useful 形容information