He takes exercise everyday, which has done a lot of good to his health. (不用as)
As has already been pointed out, English is rather difficult for a foreigner.
四、关系代词as和which的区别
注意:在such···as···, the same···as···, as···, as many/Much as···等结构中, as不能用which代替。如:
Such books as this are too difficult for beginners.
(这样的书对于初学者来说太难了。)
=Books such as this are···
=Books like this are···
I live in the same building as he (does).(同一幢楼) 四、关系代词as和which的区别
3.两者均可引导非限制性定语从句,有时可以互换,但下列情况多用as。
① 关系代词引导的定语从句居句首时。
As we all know, the earth is round.
② 当与such或the same连用时,一般用as。
Such books as you tell me are interesting.
I have the same plan as you.
四、关系代词as和which的区别
3.两者均可引导非限制性定语从句,有时可以互换,但下列情况多用as。
③ 当从句和主句语义一致时,用as,反之则用which。
She has married again, as was expected.
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