You ______ be polite to the old man.
A．shouldB．can’tC．mightD．mustn’t
A
考查情態(tài)動(dòng)詞。句意“對(duì)老人應(yīng)該有禮貌�！眘hould“應(yīng)該”；can’t“不能”；might“可能”；mustn’t“禁止，不許”。故選A。
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