答案:having 考查非谓语动词。分析句子成分可知,主语The old couple和live之间是逻辑上的主谓关系,且句中有表示一段时间的时间状语for years,因此用live的现在分词的完成式。
6.I know it's normal for such a thing to happen, but we ________(avoid) it if we'd been more careful.
答案:could/might/would/should have avoided 考查虚拟语气。句意:我知道发生这样的事情是正常的,但如果我们更小心一点儿的话,这样的事是可以避免的。根据句中的“if we'd been more careful”可知,此处表示与过去事实相反的假设,故用could/might/would/should have done结构。
7.At the conference, political leaders from many countries promised to work together to defend the world ________ terrorism and other threats.
答案:against 句意:会议上,来自多个国家的政治领导人承诺携手保护全球免受恐怖活动和其他威胁的伤害。defend...against/with...“保护……免受……的伤害”。
8.—He should have been warned of the danger.
—So he ________(be), but he wouldn't listen to me.
答案:was 考查固定句型。根据答句可知,后者赞同前者的话。此处强调的是发生在过去的客观事实,因此应用so he was。
9.(2017·全国大纲改编)Today there are more airplanes ________(carry) more people than ever before in the skies.
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