—They ________ have prepared for the meeting more carefully.
—But they didn't.What a pity!
A．shouldn't B．can't
C．may D．ought to
—They ________ have prepared for the meeting more carefully.
—But they didn't.What a pity!
A．shouldn't B．can't
C．may D．ought to
D 考查情态动词。句意：——他们本该更细心地准备会议的。——但他们没有这样做。真可惜！ought to have done过去本该做某事而未做。