【题目】His sister left home in 1998, and ____________ since.
A. had not been heard of B. has not been heard of
C. had not heard of D. has not heard of
在线课程【答案】B
【解析】
试题分析：考查时态。句意;他姐姐在1998年离开了家，从那以后就再也没有被听说过。根据本句中的副词since可知使用现在完成时，根据句意说明使用否定句，故B正确
考点 : 考查时态