摘要：B 考查情态动词.should have done本该做但事实上并未做.
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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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He have finished his work; otherwise, he would not be enjoying himself by the seaside. 【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. should B. must C. couldn’t D. can’t
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—Amazing! You wear slippers at work．
— Don’t you know it’s a fashion? 【吉林省长春市2011届高三第二次模拟考试（东北三省四市联合调研）】【情态动词】
A. might B. should C. could D. would
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