楼上jack学长回答的很可以的了，我补充几点。 一、填空题(为什么要填这个答案）： 1.I was (regret)＿＿when I learnt that he failed to pass the exam. 我错填了regretted，正确答案是regretful. 因为动词surprise、excite都可以接"人"作宾语，surprise sb.,excite sb., 所以就有过去分词形式的形容词surprised ／excited (含被动意思)。regret不能直接用"人"作宾语，所以没有过去分词形式的regretted作形容词，正确的形容词是regretful 2.Even if he needed money badly,he(never turn)＿＿to his father for help. IF句中是一般现在时，后面用一般将来时。IF句中是一般过去时，后面用过去将来时。注意时态要呼应。 正确答案是would never turn. 3.（ignore)＿＿for many years,the writer suddenly became famous. 分词短语作状语，后面有for many years这样的时间状语，一般要用分词的完成时，发生的动作在主句动作之前，也应该用完成时态。 正确答案是Having been ignored 4.I shouldn't have taken your umbrella if I(know)＿＿that it was the only one you had. 虚拟语气，主句用should/would等+现在完成时，则从句用过去完成时。 正确答案是had known. 5.Her sister(teach)＿＿English at our college since she graduated from university. 某个动作或行为从过去某一时刻持续到现在，而且还会继续进行下去，用现在完成进行时。 正确答案是has been teaching。 顺便说一下，teach的过去分词是taught,不是teached. 6.(not receive)＿＿any formal education in medicine,he could not copy with his tasks in our hospital. 同3，分词表示的动作在主句动作之前。用分词的完成时态。 正确答案是Not having received. 7.I watched television yesterday evening but I (not watch)＿＿ television so far this evening. 本题的关键在于理解"so far", "so far"意思是"到现在为止",一般都与现在完成时连用。 正确答案是haven't watched. 二、选择题（为什么要选这个答案） 1.Here are some toys.You can＿＿ one or two for your little son as a birthday present. ngle out B.pick out C.work out nd out single out是一个固定词组，表示单独挑出来格外对待、处理，另眼相看。因此不合适。 正确答案是B． 2.The real trouble＿＿ their lack of confidence in their abilities. es in 接介词in是固定用法，意思是"在于.." 正确答案是A． 3.The newspaper reported yesterday several＿＿ on the boundaries of these two countries. cidents B.happenings C. events cidents 这四个词的意思差不多，都是"事情、事件",但用法有差别。 happenings是最一般的一个； event指重要的事件，有重要意义的事件；另一个意思是项目。 accidents指造成伤亡或损失的事故。 incident指不寻常或奇怪的事情；另外也指会引起麻烦、争执、对抗等的事件；如两国间的边界冲突事件，外交事件(diplomatic incidents)等。 所以答案是A最合适。 三、解释:The audience gave their applause to the professor as they meant it. 这里mean表示"目的是...，意思是...", mean it 是常用短语，口语中常有 I mean it,就是"我心里就这个意思，这是我的真实想法，我是真心实意的". 题中的句子意思为：听众给教授发自内心的鼓掌 四、改错题：This year I received much more Chistmas cards than I had expected. 不能改为many,这里much是程度副词，修饰more(many的比较级),跟数量无关。这里cards可数已由more(many的比较级)表达了。