The research mainly deals with the difficulty the students have ________ their attention on their study all the time. [ ]A. to focusB. to be focusedC. focusi-高中英语-n多题

◎ 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

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◎ 解析

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◎ 知识点

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