the construction of the first Great Wall
举一反三
- The construction work of the Great Wall began .
- 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 took more than 2000 years and involved 19 states.
- I shall never forget (see) _______ the Great Wall for the first time two years ago.