答案：to have或 we will have
解析：这是一个宾语从句,从句中用陈述句语序,而且不知道的事情是将来的,所以用将来时
翻译：我们不知道什么时候举行足球赛.（显然还没有举行,所以用将来时.）
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We don't know when ____(have)the football match是填has还是have?
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