问题补充:
My friend, Tom, left New York in 1976 and since then.
A. hadn’t been heard of
B. hasn’t been heard of
C. hasn’t heard of
D. hadn’t heard of
答案:
A. hadn’t been heard of
(答案→)B. hasn’t been heard of
C. hasn’t heard of
D. hadn’t heard of
解析:考查时态。根据句中时间状语since then自从那时起,可知用现在完成时,句中主语与hear of听说之间为被动关系,故选B。