2. 外语
  3. Constituting one of the earliest engineering techniques, ______ in Paleolithic time was done in order to extend natural caves.

Constituting one of the earliest engineering techniques, ______ in Paleolithic time was done in order to extend natural caves.

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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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