作业帮 > 英语 > 作业

the bunsen burner is so named because it is thought----by ro

来源:学生作业帮 编辑:大师作文网作业帮 分类:英语作业 时间:2024/11/17 06:18:59
the bunsen burner is so named because it is thought----by robert bunsen,who was german by birth
having been invented to have been invented 为什么用不定式形式?不定式不是表示一次性或目的吗?
the bunsen burner is so named because it is thought----by ro
句式:sb/sth be thought to do sth/be done
to have been invented表示过去已经完成的动作
having been invented表示伴随的状态,与拘役不符.