Which phrase correctly completes this academic sentence: '______ early Mayan communities developed complex irrigation systems.'

答案解析

核心考点：学术写作规范 解题思路：学术表达需要客观性和证据支持 正确选项A依据：展示研究新发现支持结论 错误选项分析：B过于绝对，C非学术语气，D时态错误 易错点：可能误选绝对化表述而忽视学术严谨性
正确答案：A
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