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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．after

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

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