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2017届高三一轮复习小专题测试9 —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 【解析】 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。 —Is Jack on duty today? —It ____ be him; it's his turn tomorrow. A．must's B．won't C．can't D．needn't 【答案】C 【解析】 考查情态动词。根据答语的后半句可知“一定不是他值日”，can 表示推测时经常用于否定句或疑问句中。mustn't 表示禁止，不能用来表示推测。 The traffic is heavy these days. I ____ arrive a bit late, so could you save me a place? A．can B．must C．need D．might 【答案】D 【解析】 考查情态动词。根据前一句中的内容可知说话人“可能”晚到一会儿，此处表示的是不太肯定的推测，故用 might。 —Can I get out in the daytime? —No. The school rules state that no child ____ be allowed out during the day, unless accompanied by an adult. | 
