—Jane have you finished your paper?—No I my sister with her drawing all the morning.A.

问题补充：

—Jane, have you finished your paper?

—No, I my sister with her drawing all the morning.

A. help

B. helped

C. was helping

D. have been helping

答案：

A. help

B. helped

C. was helping

(答案→)D. have been helping

解析：考查时态。本题的关键词是后面的时间状语all the morning该词与现在完成进行时连用，表示动作从过去开始一直持续到现在，还在发生。句意：—Jane,你写完论文了吗？—没有，整个早晨我都在帮助我的姐姐在画画。故D正确。