—Jane have you finished yourpaper?—No Imy sister with her homework all the morning.A. he

问题补充：

—Jane, have you finished yourpaper?

—No, Imy sister with her homework all the morning.

A. help

B. have been helping

C. helped

D. was helping

答案：

A. help

(答案→)B. have been helping

C. helped

D. was helping

解析：考查时态。根据句意及时间状语all the morning可知，我一直在帮助，故用现在完成进行时，选B。