-This kind of sports is exciting. -Yes, but it's dangerous. One can't do it______

-This kind of sports is exciting. -Yes, but it's dangerous. One can't do it_______ he or she has got some training.

-This kind of sports is exciting.

-Yes, but it's dangerous. One can't do it_______ he or she has got some training.

A、if
B、after
C、when
D、unless

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