问题: 模拟卷6-31
Oil a fossil fuel _______ over millions of years
from decayed plant and animal remains buried
under thick layers of rock.
A. was thought to have formed
B. thought to form
C. was thought to have been formed
D. thought to have been formed
请详细写出解题的过程和思路。
解答:
D对。这里是过去分词thought做定语，后面的remain是整个句子的谓语动词。即：Oil a fossil fuel THOUGHT TO HAVE BEEN FORMED over millions of years from decayed plant and animal REMAINS buried under thick layers of rock.
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