问题

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

正确答案是：

同类题型

ot find a new job—Why should I I _____ as much, but I like what I’m doing.

Thanks to those brave firemen, the big firewas _________ soon.

(2013·湖南高考)He ________ sleep, although he tried to, when he got on such a hunt for an idea until he had caught it.

Do you have any difficulty ________

To my ________， he was not a little ________ at the news that he had won the first prize in the English speech contest, for he thought that he didn’t perform so well.