问题描述：
请各路高手帮帮小弟分析一下下面的句子,谢谢了!
That fact,let alone the current division between the 11 euro countries and the four,led by Britain,（that have not joined）,is likely to mean that the Union should become a multi-system entity,with some countries signing up to everything and others choosing only some things.这里我所括号的句子里那个that我觉得想问一问.非限制定语从句中不是不能用that来引导的吗?这里怎么会出现that呢?
That fact,let alone the current division between the 11 euro countries and the four,led by Britain,（that have not joined）,is likely to mean that the Union should become a multi-system entity,with some countries signing up to everything and others choosing only some things.这里我所括号的句子里那个that我觉得想问一问.非限制定语从句中不是不能用that来引导的吗?这里怎么会出现that呢?
问题解答：
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