Unlike their close cousins the blue jays, which demonstrate raucous, aggressive, selfish, and very individualistic habits, the behavior of the Mexican jay has been found to be quiet, cooperative, communal, and even altruistic.
A. the behavior of the Mexican jay has been found to be
B. the Mexican jay's behavior has been found
C. it has been found that Mexican jays are
D. Mexican jays have been found to be
E. the Mexcan jay has been found
答案是D
我的問題:為什麼Mexican jays不用定冠詞the? 謝謝大家~