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英语语法填空!Knowledge,nomatterhowbroad,isuselessitisapplied.能填however吗后面做状语

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英语语法填空!
Knowledge,no matter how broad,is useless_____it is applied.能填however吗 后面做状语
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答案和解析
不能填however,应填:unless如果不,除非
句意:知识,无论多广,如果不被运用,就是无用的.