Every a second day he went to the library for some books to read. But after a page or two, he would put the book down and pick u

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问题 Every a second day he went to the library for some books to read. But after a page or two, he would put the book down and pick up a new one.

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答案a(second)一/

解析 every second day为固定用法,表示“每隔一天”,中间不加冠词。
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