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  _____  for 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   B. Calling   C. To call    D. Called

31._____for 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                  B. Calling                     C. To call                            D. Called

_______ for 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          B．Calling     C．To call           D．Called

31._____for 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 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

____ 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

　　　 for 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　　　 B. Calling　 　　　 C. To call　　　 D. Called