单选题He was so pleased wi

问题补充：

单选题Hewassopleasedwithall______wehaddoneforhim_____hewroteusalettertopraiseusforit.A.what; whatB.what; thatC.that; whatD.that; that

答案：

D解析 all 做先行词用that引导定语从句，what不可以引导定语从句。What相当于一个名词加that。第二空的that与so连接so…… that表示如此。。。。以至