脾切除的并发症有（）。

A.腹腔内大出血

B.膈下感染

C.血栓－栓塞性并发症

D.凶险性感染

E.肺部感染

---Tom is always making so many mistakes in his English exercises!  

--- Yeah. If he ________ more careful, he ________ fewer mistakes.

A．was; will make

B．is; would make

C．were; will make

D．were; would make