因为句子没有主语,不是祈使句的话或特殊句子,用doing,所以是having,为什么用完成时态呢?因为没有受到回复,他决定再写一封,这个没有受到回复的事情对现在他的行为造成了影响,所以用have.这种情况下,not在动词前面.
_______a reply,he decided to write again.
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