请选择ABCD,L.K7g-q2P:n+P2F2U)K(B2KBirds.........when there isn’t enough food for them．4P/V-X*W2~4M5x;k'~'[,w
A.starve4P/V-X*W2~4M5x;k'~'[,w
B.are starving4P/V-X*W2~4M5x;k'~'[,w
C.starved4P/V-X*W2~4M5x;k'~'[,w
D.starves4P/V-X*W2~4M5x;k'~'[,w