请选择ABC5I.F7y.h(a'L A clever boy!:H'N5A2u1C;y7p2j6z
A.What:H'N5A2u1C;y7p2j6z
B.How:H'N5A2u1C;y7p2j6z
C.Which:H'N5A2u1C;y7p2j6z