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问题: 单选

--Excuse me, are you going to buy ___ book?
--Well, I need it for ___ class but it is too expensive.
A. the, a B. a ,the C. a,/ D. /,the

解答:

选A. 根据上下文可知道是特定的一本书,所以用不着the,而class是不特指的,所以用a.