This sentence seems rather strange to me and inapproprate, even if in the passive form. Both, every, both, all与not 连用均表示“部分否定”，无论not的位置在前还. Bear in mind that 'welcome is a noun, a verb, or an.
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能与of 连用的是either, neither, both, all, none；不能与of 连用的是every，但every one可与of连用。 3.
