题目内容：
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：【答案仅供学习，请勿对照自行用药等】
选择题：His sister left home in 1998, and_________ since.
- 题目分类：习题答案
- 题目类型：选择题
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