问题
_____ his father came back from work_____ his homework.
A:Not until; he did
B:It wasn't until; when he did
C:It was until; that he didn't do
D:It wasn't until; that he did
B:It wasn't until; when he did
C:It was until; that he didn't do
D:It wasn't until; that he did
正确答案是：
