Only when he finished his homework ______that he had made a mistake.A、he then re

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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

解析考查倒装句。句意：直到他写完了作业才发现自己犯了个错误。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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学生应该在上课之前完成家庭作业。Thestudentsshouldfinishtheirhomeworkbeforecomingtoclass