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 Some volunteers from Beijing arrived in Shanghai _____ April 29 to work for the World Expo.

         A. on                        B. at                        C. of                                  D. to

Some volunteers from Beijing arrived in Shanghai _____ April 29 to work for the World Expo.

    A. on               B. at               C. of                   D. to

Some volunteers from Beijing arrived in Shanghai ________April 29 to work for the World Expo．

A．on                B．a(chǎn)t                 C．of                D．to

Some volunteers from Beijing arrived in Shanghai _____ April 29 to work for the World Expo.

         A. on         B. at                   C. of                               D. to