和1/6：1/9可以组成比例的是请选择DCBA-w7_7_/i8{0f2X(|7y0M-B)F
A．6：90f2X(|7y0M-B)F
B．3：20f2X(|7y0M-B)F
C．2：30f2X(|7y0M-B)F
D．1/3：1/20f2X(|7y0M-B)F