Question

The other day my brother drove his car down the street at _____ I thought was a dangerous speed.

A．as

B．which

C．where

D．what

Answer 1

D

考查宾语从句，此题考查作介词at的宾语从句，I thought为插入语，所以从句中就缺少了主语，故用关系词what，几天前我的哥哥在大街上行驶，以一种我认为是非常危险的速度。故选D。