The boy is so sad because his lovely pet for four days.A. has diedB. has been deadC. is d

问题补充：

The boy is so sad because his lovely pet for four days.

A. has died

B. has been dead

C. is dying

D. has dead

答案：

A. has died

(答案→)B. has been dead

C. is dying

D. has dead

解析：for+一段时间，句子要用完成时态，并且句子的谓语动词要有延续性。句意：男孩是如此伤心的因为他的可爱的宠物死了四天了。故选B.