问题

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
B:helped
C:was helping
D:have been helping
正确答案是:
同类题型
_____ him in time, otherwise he would have fallen off the bike.
Our computer ________ at nine this morning and we haven’t been able to do anything[ ]
We tried our best and won the football match ____ one goal in the end
﹣﹣Why not go into the classroom﹣﹣The door locked.
s in hospital.—Oh, really I _____ know ,I ____ go andvisit her.