43+48-39=请选择CBA/Z*k(^*O,D4b*[6e0a0m;~2O'P'K
A.50*[6e0a0m;~2O'P'K
B.51*[6e0a0m;~2O'P'K
C.52*[6e0a0m;~2O'P'K