The article _______on this subject was written by Mr. Black.A、referredB、referri

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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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