英语三级B级
A．since
B．for
C．during
D．before
【译文】他离开家已经三个月了。
【考点】时态
【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～段时间，应去掉句末的ago。面两项也不符合题意，故选A。
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