问题补充:
his father came back from work his homework.
A. Not until; he did
B. It wasn until; when he did
C. It was until; that he didn do
D. It wasn until; that he did
答案:
A. Not until; he did
B. It wasn until; when he did
C. It was until; that he didn do
(答案→)D. It wasn until; that he did
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