They will lose the game they try their best,A．unless B．onceC．since D．after 题目和参考答案——青夏教育精英家教网——

题目内容

They will lose the game they try their best,

A．unless

B．once

C．since

D．after

A

考查连词用法。句意为“如果他们不努力，比赛就会失败。”unless意为“如果不”。故选A。

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