题目：
The project team is currently conducting two global case studies, one on commu
nity engagement in research in the developing world and _________ on commercia
lization of heath products in low-resource settings.
(A) another (B) the other
答案是A，但是前面已经提到two global case studies了，不是应该要用表达两者的the
other吗？怎么会是用表达三者以上的another呢？