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

题型：单选题题类：模拟题难易度：普通

2015届山东省滕州木石中学九年级下学期学业水平第一次模拟英语试卷

— 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

举一反三

— I'll be glad to help her, ________ needs some help.

—Of course not! ___________ I have a bad memory.

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