I was close to being killed the other day. A car passed me at I thought was a dangerous s

问题补充：

I was close to being killed the other day. A car passed me at I thought was a dangerous speed.

A. as

B. which

C. what

D. that

答案：

A. as

B. which

(答案→)C. what

D. that

解析：考查名词性从句。what was a dangerous speed 作 at 的宾语。 I thought 是插入语， what 在宾语从句中作主语。选C。