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

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(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!
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