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
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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
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