oil is a fossil fuel --over millions of years fromdecayed plant and animal remains buried...
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
a.was thought to have found b.thought to form
c.was thought to have been formed d.thought to have been formed
英语人气：418 ℃时间：2020-02-04 06:34:19
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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...
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