His sister left home in 1998,and_______...

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

B 【解析】考察时态与语态。根据关键词since可知与完成时连用，且根据句意可知是被动语态。句意：他的妹妹在1998年离开家，从那以后就再也没有被听说过。故B正确。

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