单选题 His ______ remarks are often embarrassing because of their frankness.
A. sarcastic B. urbane C. ingenuous D. sadistic

【正确答案】 C

【答案解析】(ingenuous坦率的，天真的)。句意为：由于坦率，他天真的话往往令人尴尬。A．sarcastic讽刺的；B．urbane有礼貌的；D．sadistic虐待狂的。