问题补充：
His uncle went abroad in , and since．
A. has not been heard of
B. had not been heard of
C. had not heard of
D. has not heard of
答案：
(答案→)A. has not been heard of
B. had not been heard of
C. had not heard of
D. has not heard of
解析：考察时态。根据前一句可知他叔叔出国，本题的关键词是since,这里是指出国以后就没有被听说过。
