◎ 题干
If you don't know the answer ________ something, you______say "I'm sorry."      
[     ]
A.of;must        
B. to;may        
C. to;will            
D. of; can't
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“If you don't know the answer ________ something, you______say "I'm sorry."[ ]A.of;must B. to;mayC. to;willD. of; can't…”主要考查了你对  【情态动词】【介词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。