we don't know how the a ______ Chinese people built the Great Wall without modern machines

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wedon''tknowhowthea______ChinesepeoplebuilttheGreatWallwithoutmodernmachineswedon''tknowhowthea______C

we don't know how the a ______ Chinese people built the Great Wall without modern machines
we don't know how the a ______ Chinese people built the Great Wall without modern machines

we don't know how the a ______ Chinese people built the Great Wall without modern machines
ancient古代的

ancient古代的

ancient