All her energy ____________ (集中在学习上) so she had no time for any recreation activ

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问题 All her energy ____________ (集中在学习上) so she had no time for any recreation activities.

选项

答案 were concentrated on；were concentrated on focus on/upon或者concentrate on(集中精力做某事)

解析但是主语不是人，而是“她所有的精力”，所以要用被动。

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