◎ 题干
The research mainly deals with the difficulty the students have ________ their attention on their study all
the time.
[     ]
A.to focus  
B.to be focused
C.focusing  
D.focused
◎ 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“The research mainly deals with the difficulty the students have ________ their attention on their study all the time.[ ]A.to focusB.to be focusedC.focusingD.foc…”主要考查了你对  【动名词】  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。