It is difficult for us to know the truth ______ we’ve actually looked into the case. A. until B. aft...
2022-09-19 07:44:30 63次 北京市2019届高三10月月考英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
It is difficult for us to know the truth ______ we’ve actually looked into the case.
A. until B. after
C. since D. if
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