请选择DCBA9O1h4{6t7H)P0DI had _____ unusual experience on Sunday.1g'j5`.E5w-v/r0c
A. a1g'j5`.E5w-v/r0c
B.an1g'j5`.E5w-v/r0c
C.the1g'j5`.E5w-v/r0c
D./1g'j5`.E5w-v/r0c