She can speak _____ in front of Mack, but she can’t eat

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She can speak _______ in front of Mack, but she can’t eat ______ in his restaurant.
A. free, free B. free, freely C. freely, free D. freely, freely
为什么选C呢,我查了词典,free无论作形容词还是作副词讲时,都有“自由的“或自由地”的意思,如果把它看作形容词,加ly后变副词,正确,那为什么不能直接把它看成副词呢?为什么不选A或D呢?

以下是两个单词作副词时的解释.来自新牛津汉英双解大字典,搞不清楚可以查英英解释的字典.
Freely：not under the control of another; as one wishes 自由地；随心所欲地
I roamed freely.我随意闲逛.
Free：without cost or payment 免费地
Ladies were admitted free.女士免费入场.
Free 作副词时没有自由的意思,而 Freely 没有免费的意思.
She can speak freely in front of Mack,but she can’t eat free in his restaurant.
她可以在迈克面前畅所欲言,但她不能在迈克的餐厅里吃白食.

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