商朝人刻写在龟甲或兽骨上的文字是[ ]

A．金文

B．甲骨文

C．小篆

D．隶书

—Mrs White, why are you standing here?

—I’m waiting for my son. He ___________ back from school.

A．didn’t come

B．won’t come

C．hasn’t come

D．hadn’t come