he was walking in the street ＿＿ he saw his old friend John.A.befo_英语解答

he was walking in the street ＿＿ he saw his old friend John.A.before B.when

人气：324 ℃　时间：2020-03-29 09:26:52

解答

BWhywhen后跟短动作表示当……时，……before表示的两个动作有时间差。