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题库 / Prep2007E2-SC-61
Researchers in Germany have unearthed 400,000-year-old wooden spears from what it appears was an ancient lakeshore hunting ground as stunning evidence of human ancestors who systematically hunted big game much earlier than believed.
it appears was an ancient lakeshore hunting ground as stunning evidence of human ancestors who
it appears had been an ancient lakeshore hunting ground and is stunning evidence that human ancestors
it appears to have been an ancient lakeshore hunting ground and is stunning evidence that human ancestors
appears to be an ancient lakeshore hunting ground, stunning evidence that human ancestors
appears that it is an ancient lakeshore hunting ground, stunning evidence of human ancestors who
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ABC中的it无所指代，也无法做形式主语，因为没有it xxx for sb to do sth或者 it xxx that的形式在文中出现
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