In my mind,____that famous university will be the only way to become a world-class writer.   [ ]

A. attending    

B. attended

C. attend      

D. having attended

酵母多糖（）。

A.经典途径激活物

B.旁路激活途径的固有成分

C.三条激活途径的共同成分

D.IFN-α

E.旁路途径激活物