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ThestudentswillgraduatefromthishighschoolthisJune,---theywillhavestudiedherefor3years.a.bythenb.bythattimec.bywhattimed.bywhichtime请问应该选哪个呢?能具体分析一下各个选项及其用法和意思上的区别

题目详情
The students will graduate from this high school this June,---they will have studied here for 3 years.
a.by then b.by that time c.by what time d.by which time
请问应该选哪个呢?能具体分析一下各个选项及其用法和意思上的区别吗?很着急~
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答案和解析
by that time到那次为止 by which time 到哪一次 by then到那时
by what time 到什么时候为止
应该选 A