问题补充:
Old people must be politely
A. spoken to
B. speak to
C. poken
D. spoke
答案:
(答案→)A. spoken to
B. speak to
C. poken
D. spoke
解析:被动语态中句子主语和谓语动词是动宾关系,句意:必须礼貌的对老年人说话。可知老人是说话的对象,故用被动语态,选A。
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