题目

—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 答案：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。

查看本题答案和解析