Question

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

Answer 1

C

主要测试宾语从句。此题的测试重点在于句子结构的分析。句中I thought属于插入语，可以做先去掉的处理方法。这样题干就好理解了：题中需要技能引导介词at的宾语从句的引导词还要充当从句的主语，有关这一点可以从题干中________ I thought was a dangerous speed得知。