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(2010·天津模拟)Get out of here at once. _________ not, I’ll phone the police.
A.SinceB.IfC.WhyD.When
B
考查状语从句的省略。句意:立刻离开这里,如果你不离开的话,我将给警察打电话。故选if, if not 在这里相当于if you don’t get out of here at once。 
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