单选题So far nothing _____&nbsp

问题补充：

单选题Sofarnothing_____Tom.Iwanttoknowthereason_______hehasn’twrittentome.A.heard from; whyB.has been heard from; whyC.was heard from; thatD.has heard from; that

答案：

B解析含有so far的句子应该时现在完成时态；reason作先行词，定与从句应该用that引导。