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题型:语法填空(单句) 题类:常考题 难易度:普通
人教版(新课程标准)2018-2019学年高中英语必修五Unit 5 First aid 训练卷(一)
— Yes. While at college, I ______ it a couple of times.
—I went to Ningxia and ________ there for one year, teaching as a volunteer.
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