One can’t do extreme sports _________ he or she has had some training.A．ifB．unlessC．onceD．since-高中英语-n多题

◎ 题干

One can’t do extreme sports _________ he or she has had some training.

A．if

B．unless

C．once

D．since

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◎ 解析

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◎ 知识点

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