I had just finished all my homework and was about to go to bed the phone rang.A. whenB. u

问题补充：

I had just finished all my homework and was about to go to bed the phone rang.

A. when

B. until

C. while

D. before

答案：

(答案→)A. when

B. until

C. while

D. before

解析：可联系答.案.网客服索取。