---What he enjoys great and interesting.-Yes its dangerous. 　A. sounds but B. to so

问题补充：

---What he enjoys great and interesting.

---Yes, its dangerous.

A. sounds, but

B. to sound, but

C. sounds, so

D. to sound ,so

答案：

(答案→)A. sounds, but

B. to sound, but

C. sounds, so

D. to sound ,so

解析：but但是，表示转折；so因此；表示因果。句意：他欣赏的东西听起来真棒真有趣。——是的，但是太危险了。上文主句缺少谓语动词，下文前后为转折关系，故选A。