The construction work of the Great Wall began .
举一反三
- the construction of the first Great Wall
- The construction of the Great Wall involved 19 states.
- The construction of the Great Wall took more than_________ and involved ________ .
- The construction of the Great Wall involved 19 states. A: 正确 B: 错误
- The construction of the Great Wall took more than 2000 years and involved 19 states.