Only when he finished his homework______that he had made a mistake.A、he then rea

游客2024-01-14  14

问题 Only when he finished his homework______that he had made a mistake.

选项 A、he then realized
B、did he realize
C、before he realized
D、he realized

答案 B

解析 本题考查倒装句。only位于句首时,主谓需要倒装。英语中谓语多由助动词+实义动词构成,倒装时只需将助动词提前到主语前即可。本句中助动词为did,所以句子要写成did he realize,故选B。
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