—Zhang Guorong, a HK pop singer, jumped from the top of a building and killed himself.        

—What a pity! That’s because he had______ living in the world.      [ ]

A. been fed up with  

B. been pleased with  

C. nothing to do with

D. been used to

广义表（（a），a）的表尾是（）。

A.a

B.A.

C.（）

D.（A.）