问题
单项选择题
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
答案
参考答案:B
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
参考答案:B