请教大虾一个简单的句子结构分析

marque · 发表于 2011-4-7 20:23:29

Experts estimate that ten times as much petroleum exists in such sources as tar sands, heavy oil, and perhaps even shale as in conventional reservoirs.

想请教一下大虾，这个句子的that引导的从句的成分是怎样的呢？从句的主谓宾是什么呢？谢谢

marque · 发表于 2011-4-8 09:22:39

求教额

请教大虾一个简单的句子结构分析

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