这个句子是不是是正确的？还是She doesnt run as fast as she used to do. 呢？
She doesnt run as fast as before.
She doesnt run as fast as she used to.
二句都是正确的。第二句used to为情态动词，具备替代用途，故do或run省略更好。
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这个句子是不是是正确的？还是She doesnt run as fast as she used to do. 呢？
二句都是正确的。第二句used to为情态动词，具备替代用途，故do或run省略更好。
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