Informercials are program-length TV commercials that are devoted _____ to one product. (A)unique (B)alone (C)lonely (D)solely解释并翻译，谢谢

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D单独地,单一地.C的意思是孤独的,B,A是形容词.这儿用副词.商业信息片就是一种商业电视节目,只为一种产品作宣传.