There is a big library in our city. There are more than twiceten years ago.A. books thanB.

问题补充：

There is a big library in our city. There are more than twiceten years ago.

A. books than

B. many books than

C. as many books as

D. as books as

答案：

A. books than

B. many books than

(答案→)C. as many books as

D. as books as

解析：考查倍数表达法。倍数表达法：倍数 as 形容词的原级 as…；本题的twice是两倍，放在最前面；形容词原级many放在as…as…之中，修饰books。句意：在我们城市里有一个大的图书馆。里面所有的书是十年前的两倍多。故C正确。