2. 外语
  3. People thinking about the origin of language for the first time usually arrive at the conclusion that it developed gradually as

People thinking about the origin of language for the first time usually arrive at the conclusion that it developed gradually as

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问题      People thinking about the origin of language for the first time usually arrive at the conclusion that it developed gradually as a system of grunts, hisses and cries and【C1】______　a very simple affair in the beginning.【C2】______ ,when we observe the language behaviour of【C3】______ we regard as primitive cultures, we find it【C4】______　 complicated. It was believed that an Eskimo must have at the tip of his tongue a vocabulary of more than 10 000 words【C5】______ to get along reasonably well, much larger than rite active vocabulary of an average businessman who speaks English.【C6】______　,these Eskimo words are 　【C7】______　more highly inflected than【C8】______　of any of the well-known European languages, for a【C9】______　noun can be spoken or written in【C10】______　 hundred different forms, each【C11】______　a precise meaning different from that of any other. The【C12】______ of the verbs are ever more【C13】______ .The Eskimo language is, therefore, one of the most difficult in the world to learn,【C14】______ the result that almost no traders or explorers have【C15】______　tried to learn it.【C16】______　,there【C17】______　grown up, in communication between Eskimos and whites, a jargon.【C18】______　to the pidgin English used in Old China, with a vocabulary of from 300 to 600 uninflected words. Most of them are derived from Eskimo【C19】______　 some are derived from English, Danish, Spanish, Hawaiian and other languages. It is this jargon that is usually 【C20】______　by travelers as "the Eskimo language".
【C1】
选项 A、must be
B、must have been
C、ought to be
D、should be
答案B
解析 must have done用来表示对过去某动作的肯定推测，例如：He must have been to England，for he    knows so much about that country．他一定去过英国，因为他了解那么多有关那个国家的事情。
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