问题补充:
Only at that time that he had made a lot of mistakes in his homework.
A. He realized
B. did he realize
C. he did realized
D. realized he
答案:
A. He realized
(答案→)B. did he realize
C. he did realized
D. realized he
解析: only引导的状语在句首,主句的谓语要部分倒装。
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