— Have you ever been to Shanghai ______?
— Yes. I went there two weeks ______. It is a modern city.
| A．before; ago | B．ago; ago |
| C．ago; before | D．before; before |
— Have you ever been to Shanghai ______?
— Yes. I went there two weeks ______. It is a modern city.
| A．before; ago | B．ago; ago |
| C．ago; before | D．before; before |
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