07现在完成时(have/has done) ① 表示动作到现在为止已经完成或刚刚完成,强调对现在产生的影响。 例:I bought a new house, but I haven't sold my old>我买了一所新房子,但是还没有卖掉旧的,所以现在我又两所房子。 ② 表示从过去某时刻开始,持续到现在的动作或情况,...
34.All that can be done ___. A)have been done B)have done C)has done D)has been done 35.A person beating a drum or blowing a trumpet causes vibrations in the air ___ sound waves. A) calls B) called C) is called D) are called 36...
13. The Dong Lang area has all along been part of China and under China’s continuous and effective jurisdiction. There is no dispute in this regard. Since the 1980s, China and Bhutan, as two independent sovereign States, have been engaged in negot...
B) It has become virtually inevitable. C) It has been somewhat exaggerated. D) People haven't yet reached agreement on its definition. 3. Jonathan Bishop believes that the Internet overuse problem can be solved if people ___. A)
更多内容请点击：专升本英语语法16种时态汇总! 推荐文章