She rode a car at_____I think is a dangerous speed.

应该填 what

如果用which，就变成了一个定语从句，修饰前面的名字，但前面是at,所以不能是which。 如果句子变成She rode a car a speed ____ I think is dangerous, 则该选which.

拿不定注意的话，自己上网验证一下。上google English搜索“at what I think”和“at which I think”,从搜索结果你就可以知道哪个是正确的了。

正常语序是 she rode a car at the speed which I think is dangerous.
她以一个我认为很危险的速度开车。
答案是：which
绝对是which！！！！！！！！\(^o^)/YES！

She rode a car at what I think is a dangerous speed.

at what .... speed !!!!! 强化训练答案

which

what