money has been invested to promote the traffic conditions of this city.A. A plenty ofB. A

问题补充：

money has been invested to promote the traffic conditions of this city.

A. A plenty of

B. A large amount of

C. A great number of

D. A large sum

答案：

A. A plenty of

(答案→)B. A large amount of

C. A great number of

D. A large sum

解析：句意：很多钱已经被投资到促进这个城市的交通状况上了。A. A plenty of多了个a， B. A large amount of大量“修饰不可数名词”， C. A great number of大量“修饰可数名词”，D. A large sum少了of，所以选B。