Because natural disasters occur at random times, it is difficult to warn people _______. A．at presen...
2022-12-24 22:36:16 154次 2012-2013学年浙江省高三12月月考英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Because natural disasters occur at random times, it is
difficult to warn people _______.
A．at present B．at last C．on time D．in advance
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