President Obama held talks with Chinese President Hu Jintao in Beijing, _____ economic recovery, climate change and stopping the spread of nuclear weapons.
| A．which was discussed | B．in which they-discussed |
| C．when they discussed | D．which discussed |
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President Obama held talks with Chinese President Hu Jintao in Beijing, _____ economic recovery, climate change and stopping the spread of nuclear weapons.
| A．which was discussed | B．in which they-discussed |
| C．when they discussed | D．which discussed |
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