_____my homework ,l was not allowed to watch TV.为什么用not having finished

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_____my homework ,l was not allowed to watch TV.为什么用not having finished

这里是现在分词做原因状语的用法;
doing的否定形式应在doing前面加not
本句原本是Because I did not finished my homework ,I was not allowed to watch TV.
前后两个分句主语一致,Because I did not finished my homework 使用的是主动语态;所以用ing形式