it is the third time you have arrived late this month.

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it is the third time you have arrived late this month.
1.为什么用现在完成时而不是过去完成时?
2.句中的arrived为什么不能替换成reached?

1,这里涉及到一个句型,It / This is +the+序数词+time+(that)+sb have / has done sth或者It was +序数词+time+ sb had done sth,意思是“这是某人第几次做某事了”.这是一个固定的用法,前面主句和后面从句的时态要求都是固定的,要记住.楼主的题目正是属于第一种情况.
此外,这种用法还可以改为相应的不定式结构,意思不变.
tt is the third time you have arrived late this month.=It /This is your third time to arrive late this month=You have arrived late for three times this month.
2,arrived是不及物,可单独使用；reach 是及物动词,后面要跟相应的宾语.
【俊狼猎英】团队

it is the third time you have arrived late this month. it is the third time that you have been late this month是强调句型 it is the third time that you have been late this month 什么从句 It is the third time you ( )late this week It's the third time ___late this month. A.that you arrived B It is the third time that you have been late for work this w it's the third time ___ late this month It's the third timethat you have arrived late this mouth.是什么 It’s the third time _____ late this month.　　A.that you arriv ( )it's the third time _____ late this month.A.that you arri it's the third time you__late this month A have it is the third time i __him this month