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答案解析:
1.答案: for fear that he should suffer from a heart attack
详解:
考查目的状语从句.
考查时态: “以免”可译为for fear that, in case that, lest,它们引导的目的状语从句—般用虚拟语气，故从句中用should+动词原形。
考査短语: "心脏病发作”表达为suffer from a heart attack.
2. 答案: The city must have been prosperous at one time
详解:
考查情态动词表示猜测: 表示对过去事情很有把握的推断，用must have+过去分词。
考查短语: at one time意为“曾经”。
