It was foolish of you to take a taxi you could walk there in five minutes.A. whereB. asC.

问题补充：

It was foolish of you to take a taxi you could walk there in five minutes.

A. where

B. as

C. How

D. when

答案：

A. where

B. as

C. How

D. when

解析：考查when特殊用法。在本题中when=since既然。句意：既然你步行五分钟就可以到那里，你打的去真是太愚蠢了。故D正确。