Question Number 3
When I heard the doorbell ring, I took the letter for my mother from the postman who had come to the house.
B Having had a letter for my mother, the postman came to the house, where I heard the doorbell ring and took the letter from him.
C Coming to the house with a letter for my mother, the postman rang the doorbell, which I heard, and so I took the letter from him.
D When I heard the doorbell ring, I took the letter from the postman for my mother, who had come to the house.
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