Clearly, _____ object of the game is to improve _____ children's

Clearly, _____ object of the game is to improve _____ children's math skills.
A、不填；the
B、an；the
C、不填；不填
D、the；不填
【正确答案】：D
【题目解析】：考察定冠词和不定冠词的用法，object 特指game的object，不是泛指，所以第一空选 the, children这里是泛指，本身是复数不用a, 因此第二空不填