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题型：单选题 题类：常考题 难易度：困难
北京市2019年九年级下学期英语限时练习卷
—I'm afraid not. He _________ to Sanya.
—Because I ____________ my task yet. I still need one more hour.
—Because I _________ it before.
—Because I ______ it before.
—No, I guess he is on the way.
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