去标记BNC txt文本用wordsmith 怎么无法正确统计std. sentence length

I have used xiaoz's detagging tool to remove everything other than the orignal texts and transcripts of the BNC's raw materials. it's really a great software! But when processing the documents in txt form by wordsmith, i can get correct sd. T/T ratio and other statistics. the problem is sentence length and sd. sentence length are always above 200, sometimes even 300-odd. i checked the txt, there is nothing wrong with the punctuation. how to solve the problem? what's wrong with my work? many thx for help:)
 
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