The article______on this subject was written by Mr. Black.

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问题 The article______on this subject was written by Mr. Black.

选项 A、referred
B、referring to
C、referred to

答案C

解析本题考查非谓语动词。此处为过去分词referred作后置定语，意为“被提到的···”，refer为不及物动词，后必须带介词to。

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