I 've know him since he came here.(对划线部分提问since he came here为划线部分)
问题描述:
I 've know him since he came here.(对划线部分提问since he came here为划线部分)
答
When did you know him.
I 've know him since he came here.(对划线部分提问since he came here为划线部分)
When did you know him.