__she looked up,the strange man had disappeared .Which is WRONG?

问题描述:

__she looked up,the strange man had disappeared .Which is WRONG?
_she looked up,the strange man had disappeared .Which is WRONG?
A.At the time B.When C.At the time when D.The moment
应该选哪个,为什么.

C is wrong.
At the time 和when 两个只用一个就行,都用就重复了.