His sister left home in 1998, and__________ since.
A．had not been heard ofB．has not been heard of
C．had not heard ofD．has not heard of
B。
句意為：他的妹妹在1998年離開家，自從那時就沒有音訊了。用現(xiàn)在完成時的否定結(jié)構(gòu)。
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