【单选题】
在执行一个施工项目期间。发生一些之前已识别到的风险，导致产生额外费用。项目经理应使用哪一项储备？
A. 管理储备
B. 风险储备
C. 计算储备
D. 应急储备
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答案
D
解析
参考答案：D。 解析：已识别的风险发生，使用应急储备来应对。
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