单选题
The other day, my friend John drove his car down the street at ______ I thought was a dangerous speed, and ______ surprised everyone in the car.
【正确答案】
D
【答案解析】句意：前几天，我的朋友约翰开车飞速在街道上行驶，我感觉这十分危险，并且车里所有人都受惊了。第一空介词at之后缺少宾语，选项中能引导宾语从句的只有what；并且and后为一个独立的句子，与my friend John drove his car...并列，that指代上文的内容。