-Is it for two months___they have stay here?-No,it is only three weeks__they arrive here.分别填that since,请解析清楚
问题描述：
-Is it for two months___they have stay here?-No,it is only three weeks__they arrive here.
分别填that since,请解析清楚
答
第一个 可以理解成 ： 缺表语引导词 Is it ___they have stay here for two months?-
第二个 从句意理解 since 自从 自从他们来到这里开始才三周。。。。。。。。。。。。。。
答
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.）