According to the Student Monitor,a private student market research company based in New Jersey,about 5% of or textbooks required in the autumn in the United States were digital textbooks.
这是一道改错,require-acquire,请问老师require在这里不能理解成美国学校所需要的教科书吗?
从语法角度讲,两个都对,甚至required 更多见。但人家是根据上下文从语义角度解释的,所以用acquired.
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