She has married again,which (and this,and that)was unexpected.
出乎意料的是,她又结婚了。
而as主要起与上下文连接的作用,表达说话人的看法、观点,并指出主句内容的出处或根据等。如:
Einstein,as we know,is a famous scientist.爱因斯坦,众所周知,是位伟大的科学家。
As is announced in today’s newspaper,we must improve our style of work.
今天的报纸上说,我们必须改进工作作风。
作主语时,which既可以作系动词be的主语,也可以作实义动词的主语,而as只可以作系动词be的主语。如:
He married her,which was natural.
(可用as代替which)他和她结婚,这是很自然的事。
He won a/the Nobel Prize in chemistry,which made him illustrious.
(不可用as代替which)他获得了诺贝尔化学奖,这使他名扬天下。
当定语从句位于主句之后,纯粹表示主句所述的内容,不带有“如……那样”的意思时,往往用which,而不用as。如:
They were invited to the state banquet,which was a great honor to them.
他们被邀请参加国宴,这对他们来说是莫大的荣幸。
We had to sleep in our wet clothes,which was most uncomfortable.
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