Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago, pushing back by more than 150,000 years the earliest date when it is known that humans made stone tools.
A) when it is known that humans made
B) at which it is known that humans had made
C) at which humans are known to have made
D) that humans are known to be making
E) of humans who were known to make
1：大家给看看这题考的是known这个用法吗，只知道known as Ving不对，要用known to V来代替,是不是known后面只能跟to，that从句也是不可以
2：date后面用什么词有什么讲究吗
大家给指点指点，谢谢
考时态吧
这道题答案是选E吗？
我记得当时做错了，好像选B 吧？
求教求教
C.
正过来说就是Humans are know to have made stone tools at which date.(e.g. in XXX BC).
A/B 通常我们说“(人们)知道XXX是做YYY的”的时候，是不说It is known that XXX does YYY，而是说XXX is known to do YYY.
D 用that 引导的定语从句,你必须把中心词(date)放到从句当中去形成一个完整的句子，而这里显然不可以.
E earliest date of humans 是什么意思？！人类的日期?
个人见解。土办法，没法用严密的语法规则来解释呵呵
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