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题型：单选题 题类：常考题 难易度：普通
牛津版（深圳•广州）2017-2018学年初中英语七年级下册Module 3 Natural elements Unit 6 Electricity 综合复习
—No, you ________. You have to wait until the lights turn green.
—I take part in some volunteering activities. I haven't decided.
—I'm afraid I______ I have to look after my sister.
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