问题
选择题
He failed the mid-term examination and only then _____ how much time he had wasted. [ ]
A. he realized
B. did he realize
C. he had realized
D. had he realized
答案
答案：B
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He failed the mid-term examination and only then _____ how much time he had wasted. [ ]
A. he realized
B. did he realize
C. he had realized
D. had he realized
答案：B