问题
Which of the following underlined parts is different in pronunciation from others
A:My son has got a bad habit of smoking.
B:The old man always wears his blue hat.
C:He was standing by the gate waiting for her mother.
D:When she heard the news, she laughed happily.
B:The old man always wears his blue hat.
C:He was standing by the gate waiting for her mother.
D:When she heard the news, she laughed happily.
正确答案是：
