问题
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
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
答案：B