The Greens must have been to 2010 Shanghai Expo, __________ they?
| A．hadn't |
| B．didn't |
| C．can't |
| D．weren't |
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The Greens must have been to 2010 Shanghai Expo, __________ they?
| A．hadn't |
| B．didn't |
| C．can't |
| D．weren't |
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