Question

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．which B．as

C．that D．what

 

Answer 1

B

【解析】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(shí)候，有正如的意思，且通常表示被動。Which沒有這個(gè)用法。故B正確。