C、We wish we had arrived there two hours earlier.(表示愿望虚拟）
　　D、He demanded that we (should)start right away.(表示建议虚拟)
　　E、It is(high)time that we left (should leave)now．(特殊从句虚拟）
　　F、I　would rather you gave me the book．(同上)
　　G、It is necessary that we should clean the room everyday，(主语从句虚拟)
　　H、He speaks English so fluently as if he were English． (特殊从句虚拟)

　　总之，语法是从语言实践中总结出来的规则，要边学边寻找规律，以提高学习效率。在学习中不能只记一些语法规则，要进行实践练习。通过练习，可以发现和纠正错误，而且有利于况固所学知识。

 

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