摘要：16．D.考查情态动词表示猜测的用法.表示肯定用must.表示否定和疑问用can/can’t.所以选D.
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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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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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Since you have practiced so much in driving, there ______ be any difficulty in passing the road rest. 【2010-2011学年安徽省高考自主命题仿真卷(一)】【情态动词】
A. mustn't B. shouldn't C. shan't D. needn't
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