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
C、D是主動(dòng)語態(tài)，hear of表示“聽說”，后面應(yīng)該有賓語。前句意思是“他妹妹1998年離開的家”，說明1998年前有音信，由此可判斷下句意思是“她妹妹從1998年到現(xiàn)在以來才沒有音信的（被聽說過）”，因此是現(xiàn)在完成時(shí)態(tài)。
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