that,强调句式(Is it )for two months(_that__)they have stay here?
since.it is+时间段+since+过去时间.(不过原题应该是-No,it is only three weeks__they arrived here.)
that,强调句式(Is it )for two months(_that__)they have stay here?
since.it is+时间段+since+过去时间.(不过原题应该是-No,it is only three weeks__they arrived here.)