问题
选择题
For 15 years, the United Nations has been _____ "World Water Day".[ ]
A. congratulating
B. inspecting
C. observing
D. watching
答案
答案：C
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For 15 years, the United Nations has been _____ "World Water Day".[ ]
A. congratulating
B. inspecting
C. observing
D. watching
答案：C
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