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【C20】A.whileB.forC.afterD.until
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【C2】A.BeforeB.OverC.SinceD.From
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【C19】A.beforeB.afterC.onD.until
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I was watching TV_____ the telephone rang.A. whileB. whenC. since
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【C5】A.beforeB.thatC.soD.until
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【C7】A.beforeB.untilC.afterD.since
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【C2】A.ifB.whenC.althoughD.since