自然人成为犯罪主体必须具备的条件是（）

A、必须是实施了危害社会行为的自然人

B、达到法定刑事责任年龄的自然人

C、是具有刑事责任能力的自然人

D、其行为主观上必须出于故意

Charles liked music very much when he was at school, but (41) he went to the university he decided to study medicine (42) music. When he passed his examinations and became a doctor, he had to work in a hospital for (43) . There he discovered that a lot of patients were happier if (44) music was played for them. When Charles got an office and began to work (45) himself, he decided to (46) his patients happy by having a tape recorder in his waiting room play beautiful music for them.
But (47) the tape recorder had been put in(安装), Charles’ nurse heard a woman complain in the crowded (48) , "Here we’re (49) waiting to see the doctor, and he’s just playing (50) piano in his office instead of doing his work. \

[A]sometimes[B]sometime [C]some time