15.
Even though sub-Saharan Africa often evokes images of drought and famine, researchers say that the area is the home of more than 2,000 grains, vegetables, roots, fruits, and other foods that have the possibility for feeding the continent, even other parts of the world.
(A) have the possibility for feeding the continent, even
(B) have the possibility of feeding the continent, even of
(C) could feed the continent, so even with
(D) could feed the continent and even
(E) could possibly feed the continent and, in addition, for even
答案是D
但是我不太明白D的话could不是和原句时态冲突吗，我记得情态动词里只有might和may可以互换，其他情态动词都要考虑时态的啊.
请高手指点 | 
