题目内容：

The buses were surrounded by an angry crowd, ____were already full.
a. but most of them b.most of which c,which most d.that most
选a,既然a可以那为什么b不行?

优质解答

b.most of which 才是正确选项.
根据语境,这里并没有转折的意思,故不能用but.

【俊狼猎英】团队

追问：

很多人围着车想上去但车已经很拥挤了，可以转折的啊..

追答：

你说得没错，刚才看错了，a. but most of them 才对。有转折的意思