Will you please keep quiet now? You shouldn’t&nb

问题补充：

Willyoupleasekeepquietnow?Youshouldn’ttalkuntil ______to.A.askingB.having askedC.to askD.asked

答案：

D解析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。