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To play basketball and to go swimming ___ useful for character-training.

A. was              B. is                    C. are            D. were

To play basketball and to go swimming ___ useful for character-training.

To play basketball and to go swimming ________ useful for character training.

A．was 　　　　　 B．is　　　 C．are　　 D．were

To play basketball and to go swimming ________ useful for character training.

A．was 　　　　　 B．is　　　 C．are　　 D．were

To play basketball and to go swimming ＿useful for character-training．
A．was      B．is     C．are      D．were