He has been away from home______three months ago.A、sinceB、forC、duringD、before

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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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