I didn’t know . Can you tell me?A. who to speak toB. who speak toC. who to speakD. who spo

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(答案→)A. who to speak to
B. who speak to
C. who to speak
D. who spoke
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。