oil is a fossil fuel --over millions of years fromdecayed pl

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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

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 over millions of years from decayed plant and animal remains buried.

oil is a fossil fuel --over millions of years fromdecayed pl less fossil fuel is being used as a result of the operations All____is a continuous supply of fuel oil. All that is needed is a continuous supply of fuel and oil有两i 主语是什么成分?All ___ is needed is a continuous supply of fuel oil is fossil fuel renewable and replazeble The fossil fuel once burned will react a lot of toxic gas,li 求翻译change fuel oil over to diesel oil fossil fuel economy是什么意思? 求翻译why we use oil as fuel instead of coal is that it burns b Disneyland is enjoyed by millions of people fromall over the The moon is millions of years old对millions画线提问