oil is a fossil fuel --over millions of years fromdecayed plant and animal remains buried...
题目
oil is a fossil fuel --over millions of years fromdecayed plant and animal remains buried...
a.was thought to have found b.thought to form
c.was thought to have been formed d.thought to have been formed
答案
选D.thought to have been formed over millions of years from decayed plant and animal remains buried...是fuel的定语从句,省去了that is,原文是oil is a fossil fuel （that is）thought to have been formed o...
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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