His sister left home in 1998, and_______ ever since.
A．had not been heard ofB．has not been heard of
C．had not heard ofD．has not heard of
B
考察時態(tài)語態(tài)。根據(jù)句意可知，sister與hear of之間是被動關系，根據(jù)since可知，要用現(xiàn)在完成時
句意為，他的姐姐在1998年離開了家，并且自從那時就沒有她的消息了
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