People have always been curious ___how living things on the earth exactly began.
问题描述：
People have always been curious ___how living things on the earth exactly began.
A in
b at
c of
d about
我选的是D,可答案上是B,顺便翻译一下.
答
be curious about
对…感到好奇
答案应该是D才正确
没有be curious at的搭配这本资料书很权威的哎，答案也会有错吗？