请选择ABC7z7k3Q;K.I:j/]1l Whose socks _________? ________mine.,c5N7y'n;Y9y)a
A. is it ; It is.,c5N7y'n;Y9y)a
B. are they ; It is,c5N7y'n;Y9y)a
C. are they ; They are,c5N7y'n;Y9y)a