◎ 题干
It costs      __    to travel by air as by train.      
[     ]
A.  more three times    
B.  as much tree times  
C.  three times as much
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“It costs __ to travel by air as by train.[ ]A.more three timesB.as much tree times C.three times as much…”主要考查了你对  【可数名词(单数名词,复数名词)】【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。