The organization has decided to holdcampaign to raise money forpoor in the city.A. a; aB.

The organization has decided to hold campaign to raise money for poor in the city.
A. a; a
B. the; the
C. the; a
D. a; the

A. a; aB. the; theC. the; a(答案→)D. a; the解析：考察冠词。第一空使用a泛指一次活动；第二空是固定搭配“the+形容词”表示一类事物。或者一类人。句意：这个组织已经决定进行一次活动来为这个城市里的穷人筹集钱。故D正确。

就是这个解释