请选择适当的句子补全对话，从题中A-E选出最佳选项。
Father: Jim, let me show you some old photos.
Jim: Great, dad!
1．Father: Oh, he’s your grandpa.
Jim: Wow.
2．Father: Yes, he was very healthy at that time.
Jim: He was in a blue uniform.
3．Father: Yes, he was. He worked very hard at that time.
Jim:
4． I think he should take some exercise.
Father: Right.
5．| A．Was he a policeman before? |
| B．Who’s this young man? |
| C．But now he is old and weak(虚弱的). |
| D．Let’s go and tell him. |
| E．Grandpa was strong when he was young. |
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