（英语）Why didn"t you give the wallet to the man at once?

题目

（英语）Why didn"t you give the wallet to the man at once?
Why didn"t you give the wallet to the man at once?
He ____ before l realized it was his.
A.had been disappeared
B.has disappeared
C.had disappeared
D.has been disappeared
A.C 有什么区别,分别在什么情况下用?举个例子说明一下就更好了!

答案

AC的区别就是主动和被动
disappear这个词是不及物动词,没有被动
所以选C
关于时态,有before,所以用过去完成