we ____(be)to the Great Wall twice.用所给动词适当形式填空 把时态以及构成说明白

have been to
既然是twice去过两次 必然是完成时啦。已经去过两次嘛

have been 现在完成时 表示：我已经去长城两次了。

have been

are
be to do sth = 将要去做某事

have been
我们去过长城两次了
have been to some place表示去过某地,并且回来了
have gone to some place表示去了某地,还没回来.