it is + 时间段 + since…和It has been+ 时间段 + since的问题

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• she has taken care of your daughter since you are away这句话我觉得有问题.本题是个选择题,答案是选since,如上面写的,据我了解,since不是跟完成时联用吗?就本题而言,如果选since,后面该是过去式啊,为什么是一般现在时.
• 瞬间动词可以用于完成时吗?不接具体时间 和 时间段要改变吗?如果及具体时间或接FOR/SINCE时间段呢?
• 造句it has been +时间段+since从句
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