swear to doing/having done都表示肯定做过某事,就像remember doing/having done一样,只不过用完成式having done 更强调过去曾做过,所以本人认为该题选C更好,因后文有before一词为证.
With sb/sth to do/doing /done三种结构,此处需用被动式,因为有这样的词组focus one’s eyes on/upon,故eyes与focus之间是被动关系.故选D.
swear to doing/having done都表示肯定做过某事,就像remember doing/having done一样,只不过用完成式having done 更强调过去曾做过,所以本人认为该题选C更好,因后文有before一词为证.
With sb/sth to do/doing /done三种结构,此处需用被动式,因为有这样的词组focus one’s eyes on/upon,故eyes与focus之间是被动关系.故选D.