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The sick baby_____(not be)any better in the past few days.

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The sick baby_____(not be)any better in the past few days.
The sick baby_____(not be)any better in the past few days.
has not been
从时间状语 in the past few days可以看出“在过去的几天里”,是站在现在的时间为切入点来看问题的,考虑到过去的事情对于现在的结果和影响,牵扯到现在的时间,要用现在完成时.