The other day my friend John drove his car down the street at I thought was a dangerous sp

问题补充：

The other day，my friend John drove his car down the street at I thought was a dangerous speed andsurprised everyone in the car.

A. which，that

B. which，it

C. as，which

D. what，that

答案：

A. which，that

B. which，it

C. as，which

(答案→)D. what，that

解析：D点拨 what 引导宾语从句，that 指代上文提到的内容，在后一句中做主语，前后是and连接的并列句。