题目内容

He has been back        .
A．since a monthB．for a monthC．for a month agoD．in a month
B

试题分析：since后不能接一段时间，for后接一段时间表示时间长短，用于完成时态，不能接时间点，in后面接一段时间表示在多久之后，用于将来时态。句意：他已经回来一个月了。故选B。
点评：英语介词的一个特点是一词多义，并且介词间语义交叉现象很多，习惯用法也很多，有时很难从词义上区分开来。故学习中要注意不断总结，熟记一些介词和动词的固定搭配用法及习惯用法，是完成此类问题的捷径。
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