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问题: 英语语法6

The other day,my brother drove his car down the street at ____I thought was a dangerous speed.
A.as B.which C.what D.that
要详细的过程和思路

解答:

C。
I thought是插入语,可以去掉。at what was a dangerous speed
at 后面应当接名词结构,而what从句是名词结构,况且从句缺句子成分(主语),因此不能用that,排除D。which前面必须有先行词,例如at a speed which,但这里没有,排除B。as引导状语从句,这里不能放在介词后面。