There is evidence that prehistoric humans used fire ---- 400,000 B.C.

　　(A) so early

　　(B) the earliest

　　(C) as early as

　　(D) so early that

　　答案：C

　　解释：依句意空格处需要“早在”这一意思的正确表达，只有C符合题意，用的是比较级特殊句式as...as

　　考点三 the same…as

　　此句式也常用来表示“和……一样”，the same和as既可连用，也可分开使用，

　　如：She looks just the same as before.

　　I got the same feeling as you did.

　　改错题中常将此句式误用为the same…like /than, 要练就一双火眼金睛将其识别出来

　　例题：

　　(1)

　　Meadowlarks are about the same size than robins, but they have heavier bodies, shorter tails, and longer bills.

　　应改为：as.

　　解释：the same as是固定搭配, 表示“与...一样”

　　(2)

　　Due to sophisticated transportation networks, people can now buy the same types of perishable goods in Toronto like in New York City.

　　应改为：as

　　解释：与the same相搭配的只有as, like不行