Question

I don't think he'll come by train,____?

Answer 1

应该是C

首先,该句存在否定转移情况,即“don't think ”,疑问句应该以后面的从句为主,然后再看：句意表示“我不认为他能坐火车来,是吗?”表反问,前否后肯,所以用.will he