题目内容：
第39题答案。
A．cost B．costs
C．costing
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：
单选题：第39题答案。
- 题目分类：初级
- 题目类型：单选题
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B．costs
C．costing
B．costs
C．costing
11__________
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