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英语 > -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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正确答案： D 答案分析：无
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