I keep __ ,and I'm often worried about their food.A ,a black-and-white dog B,a black andI keep __ ,and I'm often worried about their food.A ,a black-and-white dog B,a black and a white dogC,a black and white dogD,a black and a white dogs

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I keep __ ,and I'm often worried about their food.A ,a black-and-white dog B,a black and
I keep __ ,and I'm often worried about their food.
A ,a black-and-white dog
B,a black and a white dog
C,a black and white dog
D,a black and a white dogs

their可以看出来是复数的,排除A.
C 本身是错误的,D dog 不用复数
B指的是两只狗,一只白的, 一只黑的