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i was afraid to talk to him ______ i had the grammar straigh

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i was afraid to talk to him ______ i had the grammar straight in my mind
为什么选unless ? though 不行吗? 请高手讲讲.
我害怕跟他交谈除非我脑中有想好的语法.
后面那句是说脑中有直接的语法,因此判断‘我’有了语法就不会害怕跟他交谈了.
如果是though,尽管有了语法还会害怕就不是很成立了.