The influence of this book might not have been reaching so far, ________for Mr. William, who dared to publish itA.if had it not beenB.is it not beingC.had it not beenD.its only having been
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C解析本题考查虚拟语气。根据语境及主语用might have done,可知考查与过去事实相反的虚拟语气，从句用had done，B项用倒装结构，正常语序为if it had not been。