---Tom has been fired by his boss- ? As far as I know he is a hardworking and conside

问题补充：

---Tom has been fired by his boss．

--- ? As far as I know, he is a hardworking and considerate fellow．

A. Why not

B. How come

C. What then

D. So what

答案：

A. Why not

(答案→)B. How come

C. What then

D. So what

解析：

这题考查交际用语：Why not 好啊，How come怎么回事， So what那又怎样，句意是：--汤姆被老板解雇了，--怎么回事“据我所知，他是勤奋，考虑周到的人。选B。