So far nothing Tom. I want to know the reason he hasn’t written to me.A. heard from; why

问题补充：

So far nothing Tom. I want to know the reason he hasn’t written to me.

A. heard from; why

B. has been heard from; why

C. was heard from; that

D. has heard from; that

答案：

A. heard from; why

(答案→)B. has been heard from; why

C. was heard from; that

D. has heard from; that

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。