原因sister left home in 1998,and___since.a,hadn't been heard of b,hasn't been heard ofc,hadn't heard of d,hasn't heard of

原因sister left home in 1998,and___since.a,hadn't been heard of b,hasn't been heard ofc,hadn't heard of d,hasn't heard of
原因
sister left home in 1998,and___since.
a,hadn't been heard of b,hasn't been heard of
c,hadn't heard of d,hasn't heard of

原因sister left home in 1998,and___since.a,hadn't been heard of b,hasn't been heard ofc,hadn't heard of d,hasn't heard of
选B,由句子中的时间状语since判断用现在完成时,sister与heard of是被动关系,所以选B.
祝学习进步,希望采纳哦,O(∩_∩)O谢谢

姐姐1998年离开家，至今杳无音讯；现在完成被动时！a

选B吗？
首先是个被动语态，被听说
其次是现在完成时，自从1998离开家到现在都没有信息