With the noise going on outside the classroom, I had great difficulty______(集中注意

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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)

选项

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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