Between five and six Athousand years ago, humans Bdeveloped the first writing and began Cto work in metal—first in copper, then

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问题 Between five and six Athousand years ago, humans Bdeveloped the first writing and began Cto work in metal—first in copper, then in Dthe bronze.

选项 A、 
B、 
C、 
D、 

答案D

解析 The bronze is incorrect. The definite article is incorrect before bronze, an indefinite uncountable noun. Correction: omit the.
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