Only at that time that he had made a lot of mistakes in his homework.A. He realized 　B.

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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