---When should I hand in my paper?---Your paper must_____as soon as the bell_____.A.hand in; ringsB.hand in; will ringC.be handed in; will ringD.be handed in: rings
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D解析被动语态与as soon as的用法。paper作主语 (为“交卷”的承受者)，故要用被动语态，as soon as表示“一……就……”，从句用一般现在时代替一般将来时。故选择D。