— Why didn't you chat with that friendly foreigner just now?   

—  I'd like to, but the trouble was ________ he said was difficult for me to understand. [ ]

A. what which      

B. that what        

C. that that      

D. what that

生地黄、玄参的共同功效，除清热凉血外，还有：（）

A.止血

B.解毒

C.养阴

D.利尿

E.化瘀