GWD-21-Q10

（1）     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.

A.     it appears was an ancient lakeshore hunting ground as stunning evidence of human ancestors who

B.     it appears had been an ancient lakeshore hunting ground and stunning evidence that human ancestors

C.     appears was an ancient lakeshore hunting ground and is stunning evidence that human ancestors

D.     appears to be an ancient lakeshore hunting ground, stunning evidence that human ancestors

E.      appears that it is an ancient lakeshore hunting ground, stunning evidence of human ancestors who

D the best

appear 为什么用单数?请指教

what 指代从句种得an ancient lakeshore hunting ground,所以它得谓语应该用单数。

这题可以从两个点来出发判断

1, it 指代问题，排除AB

2.时态，排除C,E