单选题I didn’t know __________.

问题补充：

单选题Ididn’tknow__________.Canyoutellme?A.who to speak toB.who speak toC.who to speakD.who spoke

答案：

A解析A 考查疑问词+不定式。“和某人说话”speak to sb.，“和谁说”who to speak to。