解析 答案:has not been/hasn't been 解析:考查动词的时态和语态。句意为:在过去40年里,中国走的道路是不容易的,需要面对国内外的诸多困难。根据空前的“in the past four decades”及空后的“and it has had to”和句意可知,此处应用现在完成时的否定形式。故填has not been/hasn't been。
our country in the past decades.Ⅱ. 将下列句子改为被动语态或主动语态1. One of the best students is wri
分析句子可知,In the pat decades作时间状语时句子一般使用现在完成时,主语 some number plates是复数概念。故填 have become。2.(动词时态)started句意:从上学开始,Sarah 和 Janet就是好朋友。since引导时间状语从句,主句常用现在完成时,从句用一般过去时。故填 started。3.(动词时态和主谓一致)have been working/...
根据时间状语“In the past”可知描述过去的事情,所以用一般过去时态,且consider与主语children是被动关系,主语是复数。故填were considered。(2)题详解: 考查现在分词。句意:然而,在过去几十年中,技术进步使研究人员能够更深入地研究双语与认知和神经系统的相互作用和改变,从而确定双语的几个明显好处。空格处应该用...
C 试题分析：考查时态和语态。根据句中时间状语in the past decades在过去的几十年，可知用现在完成时，再根据主语是use，与make之间为被动关系。句意：据报道，这些废材料在过去的几十年里很少利用。故C正确。
in the last decade 时间状语，已表明是说过去的事，自然要用过去时，是否要用“完成”，看要表达的内容：1。In the past decade ，first I studied in a university then I worked for a big firm。2。In the past decade ，having finished my studying in a university I worked in a ...
In the past two decades, research has expanded(expand) our knowledge about sleep and dreams . 2)动词的语态:主要掌握各个时态的被动式。 The nations that are actively involved (involve) in earthquake prediction programs include Japan, Russia, and the United States. There we...
Grade inflation--the gradual increase in average GPAs(grade-point averages) over the past few decades—is often considered a product of a consumer era in higher education, in which students are treated like customers to be pleased. But another, related force—a policy often buried deep in co...
4. When they entered the area, the visitors (require) ___ to turn off their smartphones. 解析：空格应为谓语动词，首先考虑时态，跟从句保持一致，所以用一般过去时，再判断主语visitors 和require 之间是被动关系，又是复数，故将require变成were required ...
心 知 素 识 3.In the last decades,advances in medical technology have made it 养 梳 达 理 possible for people to live longer than in the past. 标 返首页 4 两语 课前 重 1.虽然广告给我们带来了极大的方便,但同时也给我们带来了很多烦恼。 难 三 考 言 _T_h_o_u_g_h__a...