I didn’t hear your call because I to music at that time.A. listenB. will listenC. am list

问题补充：

I didn’t hear your call because I to music at that time.

A. listen

B. will listen

C. am listening

D. was listening

答案：

A. listen

B. will listen

C. am listening

(答案→)D. was listening

解析：句意：我没有听到你的电话，因为我那时正在听音乐。结合语境可知下文从句中描述的是过去某时正在进行的动作，故用过去进行时态，选D。