he looked as thoughhe___ill for a long time.were has been为什么用were 不用has been

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helookedasthoughhe___illforalongtime.werehasbeen为什么用were不用hasbeenhelookedasthoughhe___illforalongtim

he looked as thoughhe___ill for a long time.were has been为什么用were 不用has been
he looked as thoughhe___ill for a long time.
were
has been
为什么用were 不用has been

he looked as thoughhe___ill for a long time.were has been为什么用were 不用has been
这里的were 不是时态中的过去式,是一种虚拟语气,表示推测.(详见英语语法中虚拟语气部分)不能和has been 比较.