问题
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To make their miles count, members must______.A.pay their membership fees regularlyB.fly o
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【C12】A.seldomB.sometimesC.usuallyD.never
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A.neverB.oftenC.everD.now
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A.regularB.oftenC.usualD.incidental
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材料题请点击右侧查看材料问题 查看材料A.neverB.oftenC.ev
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【C11】A.alwaysB.oftenC.sometimesD.never
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