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大学英语六级考试攻克语法必备练习 汉英 必做： 1._______that Jack has returned. 2._________is a basic assumption of social scientists. 选做★：His ability has never been in doubt,but the question is________ 答案及解析 1.It is evident 【解析】该题考点为主语从句后置，句首it充当形式主语 2.That nearly all behavior is learned behavior 【解析】该题考察主语从句的用法。主语从句需有连接词that引导，且不能省略 选做★：whether he is prepared to work hard 【解析】该题考察表语从句的使用，前文中表示never in doubt,即为肯定之意，而后文中用but转折，表示与前文不一样的感情色彩，即有些怀疑，所以应用表示不确定的引导词whether或if;由于if不能用在表语从句中，故只有使用whether. 完形填空 必做： 1. Professor Wang,___1___for his informative lectures, was warmly received by his students.Now, he walked into the classroom____2__. He was going to make a lecture about relationship between China and America today. 1.a)knowing b)to be known c)known d)having know | 
