问题
选择题
Daniel’s father left home in 2001，and ever since．
A．has not heard of
B．had not heard of
C．has not been heard of
D．had not been heard of
答案
答案：C
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Daniel’s father left home in 2001，and ever since．
A．has not heard of
B．had not heard of
C．has not been heard of
D．had not been heard of
答案：C