问题

Mike used to be a top student, but he______ behind since he lost himself in computer games.
A:fell
B:has fallen
C:was
D:has been;
B:has fallen
C:was
D:has been;
正确答案是:
同类题型
Do you know if the foottball game has started yet?—Started? It must be certain who ________ by now
She was a stubborn girl. ____, I couldn’t persuade her to change her mind. [ ]
_____ call him if you want to, but you _______,for he’ll surely come here soon.
What a ________ rain ! It has rained ______ since last night.
Well, I do think the rabbit is a beautiful, gentle animal which can run very fast. —_____.[ ]