---What were you doing at this time last night?- I a phone call.A. madeB. will makeC.

问题补充：

---What were you doing at this time last night?

--- I a phone call.

A. made

B. will make

C. has made

D. was making

答案：

A. made

B. will make

C. has made

(答案→)D. was making

解析：考察时态。联系上文，昨天这个时候你正在做什么？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D。