摘要：B考查情态动词.Mustn’t 禁止,needn’t没必要,couldn’t不能,wouldn’t不乐意.
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考查情态动词的用法。句意为：你什么意思，只有10张票吗？应该是12张。should表示可能性推测，意为“应该”，符合句意。would表示过去将来；will表示意愿；shall表示一种语气，均不合句意。
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—It’s eight o’clock already. Jack be here by now.
—Oh, he told me that he was going to see his dentist and wouldn’t be back until ten. 【河南省商丘市第一高级中学2010-2011学年第二学期高三第一次考试卷】【情态动词】
A．must B．can C．should D．need
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The Coca-Cola Company ___________ wiser to leave the old Coke alone and introduce New Coke as a brand extension. 【黑龙江省哈市五县2011年高考模拟试卷英语卷（22）】【情态动词及虚拟语气】
A. might have been B. can’t have been
C. must have been D. can have been
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