but后可跟whichthedoctoradvisedVerastronglythatsheshouldtakeaholiday,butwhichdidn'thelp上面这句话用WHICH,

Question

but 后可跟 which
the doctor advised Vera strongly that she should take a holiday,but which didn't help
上面这句话用WHICH ,

Answer 1

1楼答的很好!我仅在此补充下而已.
But
conj.但是
prep.除 ...以外
adv.仅仅,只
pron.无不
which,在句中是指代前面一句话,它们两个不能连用.
另外,which 前一般加in,by,on等介词可以连用.
but后,如果which的意思是“哪一个”这时候则可以连用.
e.g:
Rabbits run fast,but which is the fastest?