He directed exposure to pigs otherwise hepig flu.A. couldn’t getB. wouldn’t have gotten C

问题补充：

He directed exposure to pigs,otherwise hepig flu.

A. couldn’t get

B. wouldn’t have gotten

C. couldn’t have got

D. woud get

答案：

A. couldn’t get

(答案→)B. wouldn’t have gotten

C. couldn’t have got

D. woud get

解析：B考查虚拟语气的用法。依据前面意思为过去。