He has been back .A. since a monthB. for a monthC. for a month agoD. in a month
He has been back .A. since a monthB. for a monthC. for a month agoD. in a month
发布时间:2020-08-22 20:33:22
He has been back . A. since a month B. for a month C. for a month ago D. in a month
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A. since a month (答案→)B. for a month C. for a month ago D. in a month 解析: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。