问题补充:
His uncle went abroad in , and since.
A. had not been heard of
B. has not been heard of
C. had not heard of
D. has not heard of
答案:
A. had not been heard of
(答案→)B. has not been heard of
C. had not heard of
D. has not heard of
解析:
试题分析:句意:他叔叔在出国,从那以后就没了音讯。句中出现的since是现在完成时态的标志词,根据句意判断his uncle和hear of是被动关系,故答案选B。