单项选择题M:My tooth is aching badly,Doctor.Would you please have a look?W:Yes.Open your mouth,please.Your X-rays show a deep cavity.M:Will you have to pull the tooth?W:Not necessary.But you will need a filling.M:Will it hurt much?W:I’ll give you an injection,and then you won’t feel pain.And you should really take better care of your teeth.What’s wrong with the man?()
A.He has been throwing up.
B.He has got a heavy toothache.
C.He seems weak.