The teacher told him that he would have _____ if he______.         [ ]

A.  better lives, work hard              

B.  a better life, work ard

C.  better life, works hard              

D.  a better life, worked hard

下列选项中不属于社会工作研究方法的是()。

A.历史资料研究

B.实验研究

C.问卷研究

D.非干扰性研究