Suddenly the idea came to me I might turn to Mr. Smith for help.A. whatB. thatC. whichD. w

问题补充：

Suddenly the idea came to me I might turn to Mr. Smith for help.

A. what

B. that

C. which

D. whom

答案：

A. what

(答案→)B. that

C. which

D. whom

解析：句意:突然我想起了一个主意,我可以向史密斯先生求助.此处引导引导的是idea 的同位语从句,且在从句中不作任何成分,故用that。