下列关于成本计算平行结转分步法的表述中，正确的有()。

A.不必逐步结转半成品成本

B.各步骤可以同时计算产品成本

C.能提供各个步骤半成品的成本资料

D.能直接提供按原始成本项目反映的产成品成本资料

I thought Jim would say something about his school report, but he_______ it.

A．doesn't mention

B．hadn't mentioned

C．didn't mention

D．hasn't mentioned