my sister came back home ______A:every two week B:every third weeks C:every two weeks D:each two weeks选C解释为【每个两周】是固定用法,中间不用序数词的,后面如果是2以上的话要加s翻译我的姐姐每隔两周回来...再帮我解一题吧，，，等下加分，，please write on(A:each other B: every other C: each second D: every two )line to make it clear 怎么选？？ .这些是英语语法的哪部分啊？选B【every other line】固定词组一行隔一行