2. 外语
  3. He has been away from home______three months ago.

He has been away from home______three months ago.

admin2017-05-24  32
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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