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Since then,he has developed another bad habit.这句为什么用现在完成时?

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Since then,he has developed another bad habit.这句为什么用现在完成时?
这是新概念2 59课的一句话.
但是这里为什么不用过去完成时呢?现在完成时有时强调动作持续到现在.但根据课文我们知道,Rex这只狗后来离家出走,不再回来了.这是怎么回事?
Since then,he has developed another bad habit.这句为什么用现在完成时?
sine then ~~~~是最典型的现在完成时的标志,书上有的,这个很重要的~~~要记住啊
He has lived here since 1992为什么是现在完成时而不是现在完成时进行时 He has caught a bad cold since last week改错 英语 补充句子Tom has a bad habit.He h_____ to wash hands. Jack has a bad eating habit.He doesn't like carrots,cabbages He has lived here since 1992.这里为什么用has lived而不用has been livi jim has been studying since he come home 为什么用since China has developed..since 1978 and has made great progress 谁知道英语题：China has developed[ ]since 1978[rapid]用正确形式填 现在完成时的问题：and now he has just bought another garge Three years has passed since he came to China.中为什么用has 英语翻译Since then he has tried to honor her memory as best he c since 后面用现在完成时?