题目内容

7．It was not until all the fish in the pond died that________ the situation was serious．（　　）
A．did he realizeB．he realizedC．he had realizedD．had he realized

分析 直到池塘里的鱼全死了他才意识到形势的严重．

解答 答案：B．根据题干中的结构："It be not until…that…"可知，此句是not until 的强调句型．此句型要求把not until 置于被强调部分，句子剩余部分置于that后，不用倒装．not until只有在置于句首时，主句部分倒装，其倒装结构为："not until+从句（不倒）+主句（助动词/情态动词/be动词+主语+谓语剩余部分）"．由此可知，选项A和D错误．再由句子的时态分析可知，had done过去完成式表动作发生在"过去的过去"，即realize"意识到情势严重"发生在die"鱼死亡"之前，不符句意．由主从句时态保持一致可知，主句用一般过去式．故选B．

点评 not until常考两个结构：一倒装"not until+从句（不倒）+主句（助动词/情态动词/be动词+主语+谓语剩余部分）"，二强调"It be not until…that…"．时态常为一般过去式．

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