这种时态死都弄不清楚。。。求助

难道要沉了吗

答案是什么，看我想的对不对

第②题 最开始漏了一个 I
应该是
② I ______ in a foreign trade company for three years.Still,I don't regret giving up the job and living with my family.
A.Worked B.Have worked C.Had worked D.Have been working

①______ there for 15 years,the host is quite familiar with China Central Television.
A.Working B.Having worked C.To work D.Worked
②I ______ in a foreign trade company for three years.Still,I don't regret giving up the job and living with my family.
A.Worked B.Have worked C.Had worked D.Have been working
答案第一个B，第二个A
个人认为第一个有have是因为那个host还在哪里工作而第二个没有have是因为那个人已经不在那个公司工作了

③He sank into ______,when both his parents left him and went to the south in search of a better-paid job.
A.worry B.delight C.silence D.depression
④How can we ______ our potential and push ourselves to the limit without doing so called "dangerous" sports?
A.preserve B.explore C.explode D.settle

③④求解决啊

1.B
2.D
对了没

次奥，原来是你错了

谁能告诉我为什么③④选这些个答案啊啊 啊

③He sank into ______,when both his parents left him and went to the south in search of a better-paid job.
A.worry B.delight C.silence D.depression
④How can we ______ our potential and push ourselves to the limit without doing so called "dangerous" sports?
A.preserve B.explore C.explode D.settle
第三题答案D？第四题B？
第三题选D是用排比：worry不行因为逻辑上看的话父母不在不会担心而是会沮丧发愁；delight不行是因为前面用的动词是sank，也就是说心情是往下坠的，是不好的心情；silence不行因为父母走后是不会让人沉默的，用沉默的话会显得有点不合理
第四题选B因为后面接了push，也就是说前面这个词是为了打成push的目的。preserve跟settle两个词一看就知道不合适，前者指保护，后者指使固定。那么剩下的explode跟push两者连在一起不合理所以不选C，通常不会说让小宇宙爆炸以至于达成逼迫自己到极致的目的。最后剩下explore，也是最合理的单词。就是说：我们应该怎样去不做危险运动地探测自己的潜能以至于让自己达到自身条件所允许的巅峰状态呢？
早些时候看别人回复贴吧这个模式感觉很清楚，所以我也试试

先去吃个饭。。回来希望有收获累