◎ 题干
—Don't skate on the lake!  
—Why not?  Isn't it thick enough ______?
[     ]
A. to skate  
B. to skate on    
C. skate      
D. skate on
◎ 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“—Don't skate on the lake!—Why not?Isn't it thick enough ______?[ ]A. to skate B. to skate onC. skateD. skate on…”主要考查了你对  【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。