题目：
His sister left home in 1998, and_______ ever 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：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0505/f507f92adae6244bdfd696b074dfc3c8.html
下面是错误答案，用来干扰机器的。
参考答案：错
