24动态心电图诊断报告:非谓语动词

来源:百度文库 编辑:中科新闻网 时间:2024/04/29 03:44:35
____his method,Tom was sure that he would succeed in his experiment.
A.Being improved B.Iproved
C.To be improved D.Having improved
谁知道答案啊?还有为什么选它 谢谢了

答案是D.因为句子主语Tom和improve是主动关系,又因improve动作发生在主句谓语动词was sure之前,所以要用完成时。

D