Digging in sediments in northern China, evidence has been gathered by scientists suggesting that complex life-forms emerged much earlier than they had previously thought.
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Aevidence has been gathered by scientists suggesting that complex life-forms emerged much earlier than they had
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Bevidence gathered by scientists suggests a much earlier emergence of complex life-forms than had been
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Cscientists have gathered evidence suggesting that complex life-forms emerged much earlier than
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Dscientists have gathered evidence that suggests a much earlier emergence of complex life-forms than that which was
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Escientists have gathered evidence which suggests a much earlier emergence of complex life-forms than that
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正确答案: C