You shouldn’t talk until ________ to.
A．a(chǎn)skingB．having askedC．to askD．a(chǎn)sked
D

試題分析：句意：你不應(yīng)該講話(huà)直到你被問(wèn)。這里until后是省略句，完整的是until you are asked；省略的條件是從句的主語(yǔ)與主句的主語(yǔ)一致，并且從句的謂語(yǔ)動(dòng)詞用be動(dòng)詞，這里把從句中的主語(yǔ)與be動(dòng)詞都省略，故選D。
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