2. 专升本
  3. Only when he finished his homework______that he had made a mistake.

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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