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    One theory, ________ suggested by Harvard University, is that humans began cooking their food, thereby releasing nutrients locked in the raw food and reducing the time needed to chew it.
    A．whichB．as
    C．thatD．what
    B
    B 考察定语从句。One theory is that…to chew是主句，________ suggested by Harvard University是非限制性定语从句，as在引导非限制性定语从句时候，有正如的意思，且通常表示被动。Which没有这个用法。故B正确。
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