他们的 请选择ABCD3p;A4R:a-z8S5h:n2Q+F6G1X/h+g4A3G7W4t
A.its+g4A3G7W4t
B.their+g4A3G7W4t
C.they+g4A3G7W4t
D.them+g4A3G7W4t