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13.直到完成了任务,他才发现时间已经到了午夜.(Not until…)Not until he completed the task did he find it was midnight..

分析 Not until he completed the task did he find it was midnight.

解答 Not until he completed the task did he find it was midnight.
根据句意"直到完成了任务,他才发现"可知,是描述的过去的事实,故用一般过去时.
本句可以使用Not until位于句首的倒装句型,complete the task.

点评 如果不局限于题干的要求,本句的表达还可以运用其他的表达形式.
如:He did not find it was midnight until he completed the task.
It was not until he completed the task that he found it was midnight.

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