Gradessix还是gradesix?grade作等级讲用复数吗?我的课本上写着gradessixtogradestwelve
<p>问题：Gradessix还是gradesix?grade作等级讲用复数吗?我的课本上写着gradessixtogradestwelve<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">李兴林的回答：<div class="content-b">网友采纳 应该是单数啊!<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">汪小飞的回答：<div class="content-b">网友采纳 SecondaryschoolintheUSusuallycoverssevenyears,gradessixtotwelve是课本原句
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