Why didn't you give the wallet to the man at once He---(disappear)before I realized it was his.

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• Why didn"t you give the wallet to the man at once?He ____ before l realized it was his.A.had been disappearedB.has disappearedC.had disappearedD.has been disappeared我选D 这两个有什么区别?
• （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 disappearedB.has disappearedC.had disappearedD.has been disappearedA.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!
• Why didn't you give the wallet to the man at once He---(disappear)before I realized it was his.
• Why didn't you give the wallet to the man at once He---(disappear)before I realized it was his.
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