—Jane, have you finished yourpaper? —No,
问题:
—Jane, have you finished yourpaper?
—No, I my sister with her homework all the morning.
A.help
B.have been helping
C.helped
D.was helping
—Jane, have you finished yourpaper?
—No, I my sister with her homework all the morning.
A.help
B.have been helping
C.helped
D.was helping