“ I couldn’t get int o the house because I had lost my key”
A. He said he couldn’t get into the house because he had lost my key.
B. He said he hadn’t been able to get into the house because he had lost his key.
C. He said he had been able to get into the house because he had lost his key.
D. He said he hadn ’t been a ble to get into the house because he lost his key .

Câu trả lời đúng là B tại sao vậy bạn nào giải thích lý do tại sao với