问题

He is working_____ a model plane now.[ ]
A: on
B: at
C: for
D:in
B: at
C: for
D:in
正确答案是:
同类题型
______classmates are nice . I love to play with _______.
I hear the weather will ____ cold for another week.. _ I hope not. I hate cold weather..
Suddenly, all the lights in her house went _____. [ ]
When something ________ me, I can always go to my friends for help.
Harry Potter is _________ interesting story and we all like it.