问题补充：
Not untilthe exam the importance of doing homework.
A. had he failed; he realized
B. he had failed; did he realize
C. he had failed; he realized
D. had he failed; did he realize
答案：
A. had he failed; he realized
(答案→)B. he had failed; did he realize
C. he had failed; he realized
D. had he failed; did he realize
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