题目内容
It’s a pity that I haven’t bought the book ________ by Professor Liu.
- A.referred to
- B.is referred to
- C.was referred
- D.is referring
A
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。
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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