They will lose the game they try their best,A．unless B．onceC．since D．after
题型：不详难度：来源：
They will lose the game they try their best,| A．unless | B．once | C．since | D．after |
|
答案
| A |
解析
| 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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