问题补充:
He was just leaving the telephone rang.
A. while
B. when
C. as
D. until
答案:
A. while
(答案→)B. when
C. as
D. until
解析:
试题分析: 句意:电话响的时候,他正要离开。while当……的时候(主、从句动作同时发生,延续性动词),when 当……的时候(动词可为延续性动词和瞬间动词),as一边……一边,until直到(主句用延续性动词);leave离开,瞬间动词用进行时表将来时,故选B。