We haven't seen our neighbors for over a week.They __ on a t

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We haven't seen our neighbors for over a week.They __ on a trip abroad.
a:could go
b:must go
c:may have gone
d:shoud have gone
答案书后面写着C
很奇怪哦.如果说may是猜测的话.既然用了may而不是might为啥后面却跟者现在完成时呢?如果是may go还可以理解-.- 这算什么时态或者句法呢?前面是普通时后面却用完成时.

“我们一周未见到邻居”这件事和“邻居去旅行”这两件事在时间段上是一致的所以用一样的时态没问题.至于为什么用现在完成时现在完成时可以表示现在已经完成的事情,也能表示从某一个时间开始一直持续到现在的状态也许你会问：那表示持续到现在的状态为什么不用现在完成进行时呀现在完成进行时更强调动作现在完成时在表示持续到现在时更强调一种状态
另外你提到MAY GO这个答案这个是可以的一般现在时也能表示持续的一种状态
希望我的回答能令您满意

We haven't seen our neighbors for over a week.They __ on a t "-We haven't seen each other for a while,have we?-No we have A: We haven't seen such a beautiful day for a long time. I haven't seen you for a long time.(同义句) I haven't seen you They ____ each other for at least two months A.haven't seen 英语翻译1.We haven’t seen such a beautiful film for the past fou We haven't seen each other for a long (p ) of time . We haven’t seen each other for a long time.（我们很长时间没有见面了） -We haven`t seen John for a long time.-Where do you think___ 6.Since we haven’t seen each other for a long time,it will b 单句改错 We haven't seen a play performing so wonderful for quit 英语翻译i haven't seen you for a while