下列有关动物特点的叙述，错误的是

A．鲫鱼用鳃呼吸用鳍游泳

B．大鲵幼体用肺呼吸

C．丹顶鹤前肢变成翼

D．麋鹿胎生哺乳

. Will you please keep quiet now? You shouldn’t talk until ________ to.

A．asking

B．having asked

C．to ask

D．asked