题目:The first two stages in the development of civilized man were probably the invention of weapons and the discovery of fire, although nobody knows exactly when he acquired the use of the_____.(《辽宁省学士学位外语统考课程参考教材与考试指南》 辽宁省人民政府学位办公室组编 )
A. latest
B. latter
C. later
D. last
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