Mr Wang is an excellent teacher. He is to spend a lot of time explaining things to us.A.

问题补充：

Mr Wang is an excellent teacher. He is to spend a lot of time explaining things to us.

A. enough patient

B. patient enough

C. too patient

D. so patient

答案：

A. enough patient

(答案→)B. patient enough

C. too patient

D. so patient

解析： enough patient结构有误，enough修饰形容词应放在后面；patient enough

足够的耐心；too patient太耐心，一般不这么用；so patient这么耐心。句意：王老师是个优秀的老师。他有足够的耐心花费时间给我们解释这些东西。故选B。