Although he was in poor health Robert succeeded other more famous engineers failed. A. w

问题补充：

Although he was in poor health, Robert succeeded other more famous engineers failed.

A. which

B. that

C. what

D. where

答案：

A. which

B. that

C. what

(答案→)D. where

解析：本句意为“尽管罗伯特身体不好，但是他在其他著名的工程师失败的领域里获得了成功。”这里是由where引导的地点状语从句，在“…领域”是个抽象概念，但是在句中相当于地点状语。