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请问,____ you don't know the rule won't be a sufficient excuse

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请问,____ you don't know the rule won't be a sufficient excuse for your failure.
a. it is b. that c. because d. what
请帮我分析一下,这几个选项对的,为什么对,错的错在哪里.O(∩_∩)O谢谢大家!
可是我看网上说,it ,that ,what 都可以引导主语从句啊
选B,这是主语从句,you don't know the rule这句话作主语,因为这句话不缺少任何成分所以用that