I was walking in the street yesterday I met with our football coach.A. beforeB. when C. u

问题补充：

I was walking in the street yesterday I met with our football coach.

A. before

B. when

C. until

D. since

答案：

A. before

(答案→)B. when

C. until

D. since

解析：考查固定句型。固定句型：be doing sth when…正在做某事在这时…（发生了意料之外的事情）；句意：昨天我正在街上走，在这时我遇见了足球队的教练。故B正确。