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Constituting one of the earliest engineering techniques, ______ in Paleolithic t
Constituting one of the earliest engineering techniques, ______ in Paleolithic t
游客
2025-02-07
29
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问题
Constituting one of the earliest engineering techniques, ______ in Paleolithic time was done in order to extend natural caves.
选项
A、tunnels were built
B、which built tunnels
C、the building of tunnels
D、tunnels whose building
答案
C
解析
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