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_请问老师，为什么一搜这道题会出现两个正确答案？一个A一个C到底哪个是对的呢出国考试答疑器_GMAT

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题目：

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

选项:

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

提问：

请问老师，为什么一搜这道题会出现两个正确答案？一个A一个C到底哪个是对的呢

解答：

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解答：金栩竹

提问：

请问老师，为什么一搜这道题会出现两个正确答案？一个A一个C到底哪个是对的呢

解答：

阅读3233

解答：金栩竹老师

提问：

请Tina老师解答这道题~ 这道题在刷题班讲义上的答案是A，可是在题库里面的答案是C，麻烦老师讲解一下这道题每个选项，谢谢。

解答：

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解答：王文静老师

提问：

请帮忙区分A与C的差别？

解答：

阅读3327

解答： sysadmin老师

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