It’sapitythatIhaven’tboughtth

发布时间：2020-07-27 17:55:19

It’s a pity that I haven’t bought the book ________ by Professor Liu．A.referred toB.is referred toC.was referredD.is referring

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A解析referred to by Professor Liu相当于定语从句that was referred to by Professor Liu, that was在后置定语中可以省略。
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