Geologists believe that oil and coal are composed of organic molecules______(因为它们本身来自于生物).

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问题 Geologists believe that oil and coal are composed of organic molecules______(因为它们本身来自于生物).

选项

答案because they themselves are derived from living things

解析此处需要译出原因状语从句，根据主句的时态，从句要用一般现在时。“来自于”可用词组derive from表达。

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大学英语六级

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Geologists believe that oil and coal are composed of organic molecules______(因为它们本身来自于生物).

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Tobereallyhappyandreallysafe,oneoughttohaveatleasttwoorthreehobbies,andtheymustallbereal.Itdoesn’tmatte

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