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【C18】A.onB.beforeC.atD.in
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【C18】A.merelyB.alwaysC.mainlyD.almost
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【C18】A.illegalB.oddC.vainD.wrong
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【C18】A.atB.toC.inD.of
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【C18】A.thatB.whichC.whatD./
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It is rude to _____ people when they are talking.A.interfereB.interruptC.interpretD.in
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下列物质中 ( )是目前已经肯定的必需脂肪酸。A C16:2B C18:2C C18:3D C20:3(E)C20:4