肝郁化火型不寐者，宜首选：

A．安神定志丸

B．龙胆泻肝丸

C．朱砂安神丸

D．柴胡疏肝散

E．黄连阿胶汤

I don't think  _____ possible to learn a foreign language without much memory work.   [ ]

A. this                          

B. that

C. which                        

D. it