几道英语题!并能说明原因哦! 谢谢!

题目

几道英语题!并能说明原因哦! 谢谢!
We finally reached _______ the local people called the Golden Triangle.
A. where B. that C. what D. which
—— How is everything going on with your studies?
—— Quite well. Not so smoothly as I hoped, ________.
A. though B. although C. either D. too
It is _________ that we cannot understand __________ word when we are reading.
A. sure, some B. sure, a certain C. certain, some D. certain, certain

答案

1.选C.此句中what=a place that/which.先行词+that/which=what.2.选A.意思是我的学习进展得很好,但是并没有像我希望的那样顺利.此处though有不过、但是的意思.3.选C.It is certain that...是固定句式,此时不可用sure...