People thinking about the origin of language for the first time usually arrive at the conclusion that it developed 【C1】______ 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 【C1】______ as a system of grunts, hisses and cries and 【C2】______ a very simple affair in the beginning. 【C3】______ , when we observe the language behavior of 【C4】______ we regard as primitive cultures, we find it 【C5】______ complicated. It was believed that an Eskimo must have the tip of his tongue a vocabulary of more than 10,000 words 【C6】______ to get along reasonably well, much larger than the active vocabulary of a (n) 【C7】______ businessman who speaks Eng-fish. 【C8】______ , these Eskimo words are far more highly inflected (词尾变化的) than 【C9】______ of any of the well-known European languages, for a 【C10】______ noun can be spoken or written in 【C11】______ hundred different forms, each 【C12】______ a precise meaning different from that of any other. The forms of the verbs are even more 【C13】______ . The Eskimo language is, 【C14】______ , one of the most difficult in the world to learn, 【C15】______ the result that almost no traders or explorers have 【C16】______ tried to learn it. Consequently, there has grown up, in communication between Eskimos and whites, a jargon 【C17】______ to the pidgin English used in Old China, with a vocabulary of from 300 to 600 uninflected words. Most of them are 【C18】______ from Eskimo but some are derived from English, Danish, Spanish, Hawaiian and other languages. It is this jargon 【C19】______ is usually referred to by travelers 【C20】______ "the Eskimo language".  
【C2】

选项 A、must be
B、must have been
C、ought to be
D、should be

答案B

解析 该句and前说的是“第一次考虑语言的起源问题时,人们往往会得出这样的结论,即语言是从人们的咕哝、喊叫逐渐发展起来的”,and后说的是“开始是很简单的”。由此可知,这里表示的是对过去事实 (语言的起源)的猜测,应用must have+过去分词,故B 为答案。A must be指“应该是”不表示推测;C  ought to be和D should be表示“应该”,不表示推测。
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