It suddenly occurred to himhe had left his keys in the office. (·江西 25)A. whetherB. wh

问题补充：

It suddenly occurred to himhe had left his keys in the office. (·江西，25)

A. whether

B. where

C. which

D. that

答案：

A. whether

B. where

C. which

D. that

解析：D

解析It occurs/occurred to sb. that...某人想到/想起。it是形式主语，主语从句成分完整，不能用连接代词which引导，whether与where不符合句意。故选D项。