Question

Mary __________ the job he offered to her, but she didn’t.

A．can’t take

B．ought to have taken

C．should take

D．must have taken

Answer 1

B

考查虚拟语气。Ought to have taken="should" have taken意为：本应该做却未做；
根据后面的but she didn’t可知这是一个与过去事实相反的虚拟语气。
应该用：情态动词+have done的形式。