问题补充:
He failed the mid-term examination and only thenhow much time he had wasted.
A. he realized
B. did he realize
C. he had realized
D. had he realized
答案:
A. he realized
(答案→)B. did he realize
C. he had realized
D. had he realized
解析:句意:他期中考试不及格,只有到了那时,他才意识到他浪费了多少时间。
Only+副词/介词短语/状语从句等,后面的句子主体部分用倒装结构,即助动词+主语+动词原形,因此排除A,C。又根据句意,不是先意识到浪费时间了,然后考试不及格,故排除D。故选B。
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