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．a(chǎn)s
C．thatD．what
B
B 考察定語從句。One theory is that…to chew是主句，________ suggested by Harvard University是非限制性定語從句，as在引導(dǎo)非限制性定語從句時候，有正如的意思，且通常表示被動。Which沒有這個用法。故B正確。
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