作业帮（ ）one of the most imporant inventions of the time,the computer helps peopleliving in different countries to do a lot things.A.Knowing to be B.It was known C.Known as D.Which was known to be为什么不能用B,平常做题时有B的用法呀?麻
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（ ）one of the most imporant inventions of the time,the computer helps peopleliving in different countries to do a lot things.
A.Knowing to be B.It was known C.Known as D.Which was known to be
为什么不能用B,平常做题时有B的用法呀?
麻烦亲把每一项的区别和用法解释清楚（不是让亲判断答案哦）,
（ ）one of the most imporant inventions of the time,the computer helps peopleliving in different countries to do a lot things.
答案是C.Known as这是过去分词短语作状语 与句子主语 是被动关系
选项 B.It was known 后面 要跟 主语从句作真主语 须把逗号 变成that
It was known one of the most imporant inventions of the time that the computer helps peopleliving in different countries to do a lot things.
选项D 是非限制性定语从句 因为位于句首 只能用as 不能用 which
as was known to be one of the most imporant inventions of the time ,the computer helps peopleliving in different countries to do a lot things.
Known as 句子为从句。 英语语法规定单独的句子需要有连接词连接才行。如果用B则这俩句子关系为独立的两个句子，中间应该加and。 望采纳。