问题
选择题
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
答案：C
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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：C