oil is a fossil fuel --over millions of years fromdecayed plant a_英语解答

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

人气：106 ℃　时间：2020-02-04 06:34:19

解答

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...