We talked until Mr Wu asked us .
A. happily, be quiet
B. happy, to be quiet
C. happily, to be quiet
D. happy, be quiet
网友回答
A. happily, be quiet
B. happy, to be quiet
(答案→)C. happily, to be quiet
D. happy, be quiet
解析：修饰动词talk用副词happily，叫某人做某事可用ask sb to do sth，故本题选C。