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--Thiskindofsportsisexciting． --Yes，butit'sdangerous．...

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问题详情：

--Thiskindofsportsisexciting． --Yes，butit'sdangerous．...

--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

【回答】

D

知识点：连词

题型：选择题

Tags：butitsdangerous.

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