His sister left home in 1998，and ________ since.A．had not been heard ofB．has no

题型：不详难度：来源：

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

答案

B

解析

首先观察四个选项的特点：从语态来看，两个选项使用了主动语态，两个选项使用了被动语态，优先考虑出题者是否想要考查被动语态。主语His sister与hear of之间是动宾关系，因此判定此题考查被动语态。结合句意“他的妹妹1998年离开家，然后就一直杳无音讯”以及时间标志词“since”可知，此处应使用现在完成时的被动语态。