合同编号第二部分代表（）。
A.单位代码
B.合同年号
C.合同类别代码
D.合同流水序号
参考答案：B
A: I enjoyed the performance very much.
B: Yes, it was really good. I think ________ boy in white was the best actor.
A: a B: an C: the D: /
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