◎ 题干
There are five pairs _________, but I’m at a loss which to buy.
[     ]
A.to be chosen      
B.to choose from    
C.to choose    
D.for choosing
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“There are five pairs _________, but I’m at a loss which to buy.[ ]A.to be chosenB.to choose fromC.to choose D.for choosing…”主要考查了你对  【介词和介词短语】【不定式】  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。