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

游客2024-02-14  17

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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