英语翻译For three quarters of its span(跨度,范围 n)on Earth,life evo

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英语翻译
For three quarters of its span(跨度,范围 n)on Earth,life evolved almost __D__as micro-organisms微生物.
A.precisely B.instantly C.initially D.exclusively

这是2001年硕士研究生的考题,你想考研哪?还是医学呢~!嘿嘿~（你可以不回答）
分析：本题考查词汇的一般意义.(A)"精确地".(B)"立刻的".(C)"起初地,最初".(D)"独占地,排他地".(D)符合句意,为正确答案.句子的意思是：地球生命的进化过程中,有四分之三的时间几乎都是以微生物形式存在的.
ps：鄙视用翻译机器的人~

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