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急My grandfather is glad that things___so much A improved B h

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My grandfather is glad that things___so much
A improved
B has improved
C have improved
D improves
Things_____a lot over the years
A changes
B changed
C have changed
D is changing
C,C
都是从过去的一个时间点延续到现在的一个过程,确定用完成时,再结合语境,第一题C
但第二题后为“over the years”,用完成时好.