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

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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 “only+状语”位于句首时,起强调作用,句子应部分倒装,即把谓语的一部分(如助动词、情态动词、系动词等)提至主语前面,其余部分仍用陈述语序。由句中的finished一词可知,本句陈述的是过去发生的事情,所以应用一般过去时,助动词用did。故选B。
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本试题收录于: 英语题库普高专升本分类
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