题目内容：
正确选项是（ ）。
A． For B． Of
C． From
D． Upon
参考答案：
答案解析：
单选题：正确选项是（ ）。
- 题目分类：专四
- 题目类型：单选题
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B． Of
C． From
D． Upon
B． Of
C． From
D． Upon
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根据材料，请在（2）处填上最佳答案。
根据材料，请在（2）处填上最佳答案。
（ ）常设机构（ ）工作小组
（ ）常设机构（ ）工作小组
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