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Thank you for sending us ____ fresh vegetables of many kinds. You have done us ____ a great service.

A、不填；a    B、the；a       C、不填；不填       D、the；不填

Thank you for sending us ____ fresh vegetables of many kinds. You have done us ____ a great service.

A、不填；a    B、the；a       C、不填；不填       D、the；不填

Thank you for sending us ____ fresh vegetables of many kinds. You have done us ____ a great service.

    A. 不填；a    B. the；a    C. 不填；不填    D. the；不填

Thank you for sending us ____ fresh vegetables of many kinds. You have done us ____ a great service.

A、不填；a  B、the；a   C、不填；不填   D、the；不填

Thank you for sending us ____ fresh vegetables of many kinds. You have done us ____ a great service.

  A. 不填；a    B. the；a    C. 不填；不填    D. the；不填