问题补充:
Everyone be polite to the old people.
A. may
B. should
C. can
D. could
答案:
A. may
(答案→)B. should
C. can
D. could
解析:此题重点考查情态动词的用法,may可以,should应该,can能够,could是can的过去式,句意:每个人都应该对老年人有礼貌。根据句意可知选B。
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