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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

提问时间:2021-03-19

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...
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