For three-quarters of its span on Earth, life evolved almost ______ as micro-organisms.

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问题 For three-quarters of its span on Earth, life evolved almost ______ as micro-organisms.

选项 A、precisely
B、instantly
C、initially
D、exclusively

答案D

解析 由three-quarters和almost可知,生命在进化过程中,有四分之三的时间几乎都以单一的形式存在。exclusively表示“排外地,专有地”,符合句子语境,故D正确。precisely表示“精确地,正好”;instantly表示“立即地,即刻地”;initially表示“最初,开头”。
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