试题 试卷
题型：单选题 题类：模拟题 难易度：普通
上海市杨浦区2017届九年级下学期英语4月质量调研（二模）试卷
—Great. We were all _______ with the _______ trip.
—I think it is because of the aging of population (人口老龄化).
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