Welcome to the Science Museum everyone! This stone axe in South Africa and experts can’t

问题补充：

Welcome to the Science Museum, everyone! This stone axe in South Africa and

experts can’t be exactly sure about its use.

A. had been found

B. was found

C. has been found

D. would be found

答案：

A. had been found

(答案→)B. was found

C. has been found

D. would be found

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