Everyone ______ be polite to the old people.
A．mayB．shouldC．canD．could
B
此題重點(diǎn)考查情態(tài)動(dòng)詞的用法，may可以，should應(yīng)該，can能夠，could是can的過去式，句意：每個(gè)人都應(yīng)該對(duì)老年人有禮貌。根據(jù)句意可知選B。
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