His sister left home in 1998, and since.A. had not been heard ofB. has not been heard ofC.

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

A. had not been heard of(答案→)B. has not been heard ofC. had not heard ofD. has not heard of解析：考查时态，句意：他的妹妹在1998年离开了家，自从那时候起再也没听到过她的消息。根据语境没有她的消息动作是从过去持续到现在，所以选B。

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