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
网友回答
A. can’t take
(答案→)B. ought to have taken
C. should take
D. must have taken
解析：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。