---I called you yesterday but no one answered.---I my car when you called me.A. was wash

问题补充：

---I called you yesterday, but no one answered.

---I my car when you called me.

A. was washing,

B. washed

C. washing,

D. am washing

答案：

(答案→)A. was washing,

B. washed

C. washing,

D. am washing

解析：句意：我昨天给你打电话了，但是没有人接。——当你打电话给我时，我正在洗车。结合语境可知下文描述的是过去某时正在进行的动作，故用过去进行时态，选A。