Do you have any idea of the reason he referred to？A. thatB. whereC. whyD. when

问题补充：

Do you have any idea of the reason he referred to？

A. that

B. where

C. why

D. when

答案：

(答案→)A. that

B. where

C. why

D. when

解析：易错选C,这里reason作 referred to的宾语,而非状语.