谁给分析一下这句英文倒装句的结构
because at no previous time has American security been as seriously threatened from without as it is today.
来自 Roosevelt 1941年的国会演讲
人气：447 ℃ 时间：2020-04-11 02:15:33
解答
at no previous time 属于否定词提到句首,采取部分倒装,正常语序为:because American security has been as seriously threatened from without at no previous time as it is today.
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