Tom you’ve got a D in chemistry?—Well I find the subject hard and I think I’ll drop it

问题补充：

Tom, you’ve got a D in chemistry．?

—Well, I find the subject hard and I think I’ll drop it for history next term．

A. What if

B. How come

C. Why not

D. So what

答案：

A. What if

(答案→)B. How come

C. Why not

D. So what

解析：考查交际用语。What if如果…怎么样；How come什么原因；Why not为什么不；So what那又怎样。Tom你化学 D，怎么回事？所以选B。