Like many other theropods discovered in the Yixian Formation, a coat of filamentous structures was preserved with the fossil skeleton, which are commonly recognized as the precursors of feathers.
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Aa coat of filamentous structures was preserved with the fossil skeleton, which are commonly recognized as the precursors of feathers
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Bthe fossil skeleton had been preserved with a coat of filamentous structures, which are commonly recognized as the precursors of feathers
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Cthe fossil skeleton was preserved with a coat of filamentous structures commonly recognized as the precursors of feathers
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Da coat of filamentous structures, which are commonly recognized as the precursors of feathers, had been preserved with the fossil skeleton
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Ea coat of filamentous structures, commonly recognized as the precursors of feathers, was preserved with the fossil skeleton
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正确答案: C