备用信用证贷款币种主要为（）。
A.美元
B.港元
C.欧元
D.人民币
参考答案：D
成本管理的原则是什么？
— He got his first book published. It turned out to be a bestseller.
— When was __________?
—__________ was in 2000 when he was still in college.
A．that; This
B．this; It
C．it; This
D．that; It
