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A short time before,great trees had covered the countryside

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A short time before,great trees had covered the countryside for miles around.
为什么用过去完成时
a short time before 如果是过去的时间为什么不用过去时，而要用过去完成时
A short time before,great trees had covered the countryside
按句意来理解,看时间状语,a short time before 这个时间说的是过去的时间,所以用过去完成时.
如果时间状语改成Now,就应该用现在完成时了.Now,great trees have covered the countryside for miles around.
对比理解一下.
A short time before,great trees had covered the countryside Last Sunday,I had a great time.I went to the countryside wit We had a great time in the countryside.改为同义句 Billy had a great time the day before yesterday,是选didn't he I had a great time you()had a great time only a very short time before The boy had a great time at Water W_______. he had a great time at the party The beaches were f___.We had a great time there. had great park weekend they a time last the in had a great time的同义词.是什么?