题目

I was caught in a traffic jam for over an hour, otherwise, I ________ (keep) you waiting for such a long time. 答案：wouldn't have kept　句意：我在交通堵塞中被困了一个多小时，否则我不会让你等这么长时间。句中用了虚拟语气，otherwise说明后面句子的内容和过去事实相反，指如果不被交通阻塞困住，句子谓语动词用“would/should/could/might ＋have＋过去分词”形式。

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