Yesterday I was just to go out someone telephoned me.A. whenB. whileC. asD. that

问题补充：

Yesterday I was just to go out someone telephoned me.

A. when

B. while

C. as

D. that

答案：

(答案→)A. when

B. while

C. as

D. that

解析：本句考查的是when 引导的时间状语从句，while表示的前后动作同时发生，本句不强调这个，故选A