问题

Has Sam finished his homework today — I have no idea. He ________ it thismorning.
A:did
B:was doing
C:has done
D:had done
B:was doing
C:has done
D:had done
正确答案是:
同类题型
Take care! Accidents _________ happen along this partof the road
Do you still remember when we went to Australia–I can’t remember now but ______ sometime last winter
They had an accident on the road and didn’t ________ at their hotel until after midnight.
Are we going to be late for the movie—________. We still have half an hour before the movie begins.