In the 1960s，a lot of old city walls in Beijing________because people thought them useless．
| A．pull down |
| B．have pulled down |
| C．were pulled down |
| D．had pulled down |
In the 1960s，a lot of old city walls in Beijing________because people thought them useless．
| A．pull down |
| B．have pulled down |
| C．were pulled down |
| D．had pulled down |
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