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

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

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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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大学英语四级

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