◎ 题干
Don't you think it necessary for us ____     the teacher for hel.p:l            
[     ]
A. to ask                
B. ask                
C. asking
◎ 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 you think it necessary for us ____ the teacher for hel.p:l[ ]A. to askB. askC. asking…”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。