【单选题】

"Can I see my baby " asked the happy new mother. When the baby was in her arms, she couldn’t believe her eyes. The baby was born without ears.

Time proved that the baby’s hearing was perfect though he had no ears. He got on well with his classmates.But one day, he said to his mother, tears in his eyes, "A、big boy called me a freak."
The boy’s father asked the family doctor, "Could nothing be done "
"I believe I could graft on a pair of outer ears if they could be gotten," the doctor saiD、They tried to find a person who would be helpful for the young man.
One day, his father said to the son, "You’re going to the hospital, son. Mother and I have found someone who will donate the ears you neeD、But we must keep it a secret who the person is."
The operation was a great success, and a new person appeared. His cleverness and hard work made him a very successful person. He married and lived a happy life.
He would ask his father, "Who gave me the ears I could do enough for him or her."
"I do not believe you could," said the father. "The agreement was that you are not to know... not yet.
The years kept it secret, but the day did come. He stood with his father over his mother’s body. Slowly, the father raised the thick, brown hair. To his surprise, the son found his mother had no outer ears.
"Mother said she was glad she never had her hair cut," his father said in a low voice, "and nobody ever thought mother less beautiful, did they \
Which of the following is TRUE、according to the passageA．The boy couldn’t hear without ears at first.
B．The boy didn’t know the truth until his mother dieD、
C．His parents often encouraged him to work harD、
D．His classmates were always making fun of him.