Mary __________ the job he offered to her, but she didn’t.
A．can’t takeB．ought to have takenC．should takeD．must have taken
B
考查虛擬語氣。Ought to have taken="should" have taken意為：本應(yīng)該做卻未做；
根據(jù)后面的but she didn’t可知這是一個與過去事實相反的虛擬語氣。
應(yīng)該用：情態(tài)動詞+have done的形式。
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