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Tom can run very ___,but his sister can't run so ___.

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Tom can run very ___,but his sister can't run so ___.
A.fast,quick B.fastly ,quick C.fast,quickly D.fastly ,quickly
选哪一个,请详细说明为什么?
选C
fast的形容词和副词同型都是fast,这里是用作副词用来修饰run;
quickly是副词,这里用来修饰run,
因此选C