下列哪项不属于图书馆用户服务范畴（）。
A.流通推广
B.用户研究
C.文献组织
D.参考咨询
参考答案：C
He works in China now, But he ______in Africa for eight years .
A．worked
B．has worked
C．had worked
D．has been working
脑卒中卧床患者如何保持大便通畅？
