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I didn’t know he came back            I met him in the street.

A. since        B. when            C. until          D. after

I didn't know he came back ________________ I met him in the street.

A. since

B. when

C. until

D. after

I didn’t know he came back __________ I met him in the street .

A．since                            B．when            C．until            D．a(chǎn)fter

I didn’t know he came back __________ I met him in the street .

A．since                            B．when            C．until            D．a(chǎn)fter