Old people should politely.A. be spoken toB. speakC. speak toD. to be spoken

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(答案→)A. be spoken to
B. speak
C. speak to
D. to be spoken
解析：根据题干，本句的意思是“与老人说话应该有礼貌”，此处的old people放在了前面，说明应该是被动语态，故应该用be spoken to；如果理解成“老人说话应该有礼貌”是主动语态，就错了。所以本题选A。