参考答案:C
答案解析:[解析] 考查定语从句中关系代词的用法。当先行同是不定代词(如:all, little, much等)或被它们修饰时,要用that, 不用which。what不可以引导定语从句,when表示时间,在句
翻译题:The price will be about two-thirds that of a new book and generally they are in good condition. If you take a course for which the professor has selected a new text, then you are stuck paying the full price for it.
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