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 【B1】______ a very simple affair【B2】______ . 【B3】______, when we observe the language behaviour of 【B4】______ we regard as primitive cultures, we find it 【B5】______ complicated. It was believed that an Eskimo must have at the tip of his tongue a vocabulary of more than 10,000 words 【B6】______ to get along reasonably well, much larger than the【B7】______ vocabulary of an average businessman who speaks English.
    【B8】______ these Eskimo words are far more highly inflected than 【B9】______ of any of the well-known European languages, for a【B10】______noun can be spoken or written in【B11】______hundred different forms, each【B12】______a precise meaning different from【B13】______of any other. The forms of the verbs are even more【B14】______. The Eskimo language is,【B15】______one of the most difficult in the world to learn,【B16】______the result that almost no traders or explorers have【B17】______tried to learn it.【B18】______, there has grown up, in communication between Eskimos and whites, a jargon【B19】______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 but some are derived from English, Daish, Spanish, Hawaiian and other languages. It is this jargon that is usually【B20】______by travellers as "the Eskimo language".
【B1】

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

答案B

解析 考查语篇理解。从句意来看,这里是对语言的起源进行判断,是过去的事情,B.must have done表示对过去发生的事情的肯定推断,符合句意,为正确选项。must be/do表示对现在情况或状态的肯定推断;should do与ought to do意义与用法基本相同,表示关于目前情况的主观态度和意见,而不是判断,三项均不符合题意。
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