With the noise going on outside the classroom, I had great difficulty______(集中注意力复习功课)

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问题 With the noise going on outside the classroom, I had great difficulty______(集中注意力复习功课)

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答案in focusing on reviewing the lessons

解析 ①has/have difficulty in doing sth.结构表示“做某事有困难”;②“集中注意力”可用focus on,concentrate on;③“复习功课”通常用review/go over the lessons表示。
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