I've known him _since he came him._(对划线部分提问） ------ -------- --------- you known him?

I've known him _since he came him._(对划线部分提问） ------ -------- --------- you known him?
I've known him _since he came him._(对划线部分提问） ------ -------- --------- you known him?

I've known him _since he came him._(对划线部分提问） ------ -------- --------- you known him?
I've known him since he came here.
对划线部分提问 How long have you known him?
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