GWD-21-Q10

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.

1. it appears was an ancient lakeshore hunting ground as stunning evidence of human ancestors who
2. it appears had been an ancient lakeshore hunting ground and stunning evidence that human ancestors
3. appears was an ancient lakeshore hunting ground and is stunning evidence that human ancestors
4. 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

正确答案是D，求高手指点。