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Only when he finished his homework ______that he had made a mistake.A、he then re
Only when he finished his homework ______that he had made a mistake.A、he then re
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2025-03-03
12
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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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