After months of ________, I personally can conclude that it was pretty much an arbitrary policy. ( 章节：1 难度：3)_做题室

单项选择题After months of ________, I personally can conclude that it was pretty much an arbitrary policy. ( 章节：1 难度：3): A、investment; B、diameter; C、transmission; D、observation

正确答案：D
答案解析：
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