In the past twenty years, a huge amount of environmental damage has been caused(cause) by air pollution. 相关知识点: 试题来源: 解析 答案:has been caused.根据题意,本题考查动词的时态。根据句意和in the past twenty years可知,故用现在完成时态;再者damage和cause之间属于被动关系,故填has been ...
解析 C 本题考查现在完成时态和主谓一致。题目中“In the past twenty years”提示使用现在完成时态,而主语“an increasing tendency”为单数,因此谓语动词也应为单数形式。选项C“has been”符合要求,为现在完成时态的单数形式。其他选项均不符合要求。因此,正确答案为C。反馈 收藏 ...
in the past twenty years（在过去的二十年里）in the past +数词+years/ months/ weeks等时间名词，意思是在过去的若干时间里（从过去到现在或从现在到过去），用于现在完成时态。例句：1、In the past twenty years they have been dealing with quite a few international corporations successfully....
C 考查固定短语的用法。句意“在过去的二十年里，中国发生了巨大的变化。”take place“发生”，不用于被动语态，排除A、B；happen“（偶然）发生”，不用于被动语态。in+一段时间与现在完成时连用。故选C。
因此,现在完成时(Present Perfect Tense)是最常用的时态之一,因为它可以表示从过去某一时间点开始一直持续到现在的动作或状态。 例如:“I have learned a lot in the past 20 years.”(在过去的20年里,我学到了很多。) 现在完成时的结构: 主语+ have/has + 过去分词 在这个结构中,“have”或“has”是助...
根据题干可知in the past twenty years表示在过去的二十年里,其是现在完成时态常用的时间状语,结构是主语+have/has done。其次great changes表示巨大的变化,take place表示发生,in China表示在中国。故答案是:Great changes have taken place in China in the past twenty years. Great changes have taken place ...
In the past twenty years, there has been an increasing tendency for workers to move from one country to another. While some newly independent countries have understandably【C1】___ most jobs to local people, others have attracted and welcomed migrant workers. This is particularly the case in ...
阅读短文.根据要求完成下面各小题.In the past twenty years, riding bicycles has become more and more popular among people of all ages. 83 Bicycles have long played an important part in the liyes of American young people. But today an even greater number of
答案是:in the pastyears用于一般过去时。in the past years读音:英 [ɪn ðə pɑːst jɪəz] 美 [ɪn ðə pæst jɪrz] 释义:过去几年。语法:基本意思是“持续”“耐久”。引申可表示“够…之用,使得以维持下去,经受住”等。last常用作不及物动词,不接宾语,也不用于被动结构...