I have been with the two classes for a year.中与for a year相近的是
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I have been with the two classes for a year.中与for a year相近的是

句子意思:我与两个班级相处时间已经有了1年了(换句话说,也就自从1年前就开始了)

答案为C (since a year ago :自从1年前就开始了)

A a year ago B before a year C since a year ago D since a yea