题目内容
17.We _____ about 1,600English words since we began to learn the language.( )| A. | learn | B. | learned | C. | will learn | D. | have learned |
分析 自从我开始学习这门语言以来,我已经学了大约1600个英语单词.
解答 答案:D
根据since we began to learn the language,可知应该用现在完成时态.since we began to learn the language是现在完成时的标志词.现在完成时态表示过去发生或已经完成的动作对现在造成的影响或结果.或从过去已经开始,持续到现在的动作或状态.本题属于从过去已经开始,持续到现在的动作或状态,现在完成时态的构成:助动词have/has+过去分词,故选:D.
点评 本题主要考查动词时态,做此类题目要注意时间状语、标志词.根据上下文所表达的含义,做出判断.同时更应记清时态的构成形式.就本题而言,主要考查现在完成时态.
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A.One.
B.Two.
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| Lord Kelvin,a famous scientist,1800s Opinion:Airplanes would never fly. Was he right?No.On December 17,1903,the Wright brothers made the first controlled flight in a powered airplane. |
| Lee DeForest,a pioneer in radio,TV,and radar,1900s Opinion:No person would ever reach the moon. Was he right?No.On July 20,1969,Neil Armstrong stepped onto the moon. |
| Leonardo da Vinci,artist,scientist,inventor,1400s Opinion:People would fly in a machine with an overhead propeller. Was he right?Yes.This artist's sketch,made about 1490,shows a helicopter 400 years before its invention. |
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A.Lord Kelvin.
B.Lee DeForest.
C.Leonardo da Vinci.
D.Jules Verne.
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A.airplanes would never fly
B.no person would ever reach the moon
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33.How many experts'opinions proved right according to the passage?B
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C.Three.
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