英语三级B级
单选题He has been away from home ________ three months ago.
参考答案：A进入在线模考
本题答案选A。句意：他离开家已经三个月了。本题考查时态。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。
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