—What were you doing when I phoned you last night?—I﹍﹍my painting and was starting to take

问题补充：

—What were you doing when I phoned you last night?

—I﹍﹍my painting and was starting to take a bath.

A. have already finished

B. was finishing

C. had just finished

D. was going to finish

答案：

A. have already finished

B. was finishing

(答案→)C. had just finished

D. was going to finish

解析：选C。由“我要洗澡”可知昨天你打电话时“我刚刚画完”，“画完”在“打电话前”之前，即过去的过去，故用过去完成。