问题
选择题
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
答案
答案：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。