Sixty percent of the therapy-only group improved,as did fifty-fiv_英语解答

Sixty percent of the therapy-only group improved,as did fifty-five percent of the Zoloft-only group.
as did 的用法
能分析下语法吗

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解答

表示同样,
相当于Sixty percent of the therapy-only group improved.Fifty-five percent of the Zoloft-only group improved,either.