Only when he finished his homework _____ that he had made a mistake.
A. he then realized
B. did he realize
C. before he realized
D. he realized
A. he then realized
B. did he realize
C. before he realized
D. he realized
【答案】
A. he then realized
B. did he realize
C. before he realized
D. he realized
A. he then realized
B. did he realize
C. before he realized
D. he realized
【答案】
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