题目内容

. Will you please keep quiet now? You shouldn’t talk until ________ to.
A.askingB.having asked C.to askD.asked
D
考查状语从句的省略。句意:请你现在保持安静好吗,你不应该说话直到你要求被说。完整形式为:You shouldn’t talk until you are asked to.故选D。
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