____ a strong and fair climate agreement at the key UN summit in Copenhagen, 50,000 people in London wore blue and went to the streets．
| A．Call for | B．Calling for | C．To call for | D．Called for |
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____ a strong and fair climate agreement at the key UN summit in Copenhagen, 50,000 people in London wore blue and went to the streets．
| A．Call for | B．Calling for | C．To call for | D．Called for |
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