3道语法题1.Among the Inuit peoples of arctic Canada,poetry conte

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3道语法题
1.Among the Inuit peoples of arctic Canada,poetry contests are held to settle conflicts that might otherwise "be" disruptive to families and communities.
文中的"be"是正确的.为什么引号处可以用be?
2.In 1508,the Spanish explorer Juan Ponce de Leon -- the same Ponce de Leon who later "would seek" the fountain of youth -- landed on Pueto Rico accompanied by a small force
文中“would seek”是正确的.为什么这里可以用“would"?
3.Malaria,a disease which "has been" almost completely eradicated in the US,is still a threat to travelers in some foreign countries.
文中”has been"是正确的.为什么这里可以用完成时?一般现在时不行么?
第一题就免了吧...亏我还打字上去的，没看到"might"...请教后面两题

第一个应该是词组 might be 第二个who later "would seek" the fountain of youth 是过去将来时第三个almost completely eradicated in the US是过去发生的对现在造成影响,用完成时
再问：嗯，谢谢... 但是为什么第二个要用过去将来时？第三个您说是过去发生的对现在造成影响...我有点不明白~
再答：第二句你问的地方是个从句，主句的时间是1508年，从句是介绍他的，说他将来发生的事现在完成时是过去发生并且已经完成的动作对现在造成影响或后果，过去某一时间开始并一直持续到现在并且有可能还会持续的动作或状态。第三句那个疾病从过去到现在几乎完全消除当然是用完成时

一道sat语法题 Among the Inuit peoples of arctic Canada,poetry con the obriginal peoples of Canada. 英语翻译The interactions among peoples of different civilization 连词成句the north of Canada,Greenland,live ,in,the Inuit,and 连词成句 the north of Canada,Greenland,live,in,the Inuit,and Inuit,live,in,the ,north ,of ,Canada,and ,Greenland,the连词成句, the struggle of peoples是 THE WITNESS OF POETRY怎么样 The inuit legend of sedna the sea goddess课文翻译 the Peoples of the Dreaming是什么意思? 急!the First Peoples of Australia是什么意思? PEOPLES HISTORY OF THE UNITED STATES怎么样