Believe it or not I'm sure that is people call the six sense.A. whenB. whatC. whichD. why

问题补充：

Believe it or not，Im sure that is people call the six sense.

A. when

B. what

C. which

D. why

答案：

A. when

(答案→)B. what

C. which

D. why

解析：句中call后缺少成分，所以用what。