He has been away from home______three months ago.

admin2016-07-10  51

问题 He has been away from home______three months ago.

选项 A、since
B、for
C、during
D、before

答案A

解析 句子为现在完成时,故判断出应该使用介词since,若选for,则表示一段时间,应去掉句末的ago。后面两项也不符合题意,故选A。
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