Question

The other day, my father drove his car at ___ I thought was a dangerous speed.

A．as

B．that

C．which

D．what

Answer 1

D

考查宾语从句。I thought是插入语，可以省略。What I thought was a dangerous speed是介词at的宾语，what在句中做主语。句意：前一天，我的父亲以一个我认为非常危险的速度开车。