Old people must ___politely A.speak to B.be spoken at C.be spoken to D.be spoken

问题描述:

Old people must ___politely A.speak to B.be spoken at C.be spoken to D.be spoken

Option D is absolutely correct.
The word "politely" modifies the verb.

翻译过来是,对老年人说话要有礼貌。说话的对象是老年人也就是被动语态了,speak to 是固定短语,选C

选C
加油!

D must后要用动词原形,speak是动词后跟形容词