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Don't press the red button ,_______you will set off the alarm.
A.butB.orC.soD.and
B

试题分析:考查固定句式。题意:不要按红色按钮,不然警报就会拉响。“祈使句,and / or … ”是一个固定句式,“祈使句”相当于一个“条件”,符合该条件就会有后面的结果,用and;不符合该条件就会有后面的结果,用or。本题or =" if" you press the red button。故B项正确。
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