16.The little girl asked what____to her friend. A.has happened B.happened C.had happened D.would have been happened 17.John____a book when I saw him. A.is reading B.read C.was reading D.reading 18.He said he____ return later A.will B.would C.can D.would be 19.Jack____the door A.has just opened B.open C.have opened D.opening 20.I have been waiting for you_____ A.since early morning B.for two hours C.for two hours D.All are correct Giúp mình vs chiều nộp rồi ạ.

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