Constituting one of the earliest engineering techniques, ______ in Paleolithic t

游客2024-01-04 53

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

转载请注明原文地址:https://www.tihaiku.com/zcyy/3331924.html

相关试题推荐

随机试题

最新回复(0)

"EngineeringClass"[img]2012q1/ct_etoefm_etoeflistz_1501_20121[/img][br]Whatd