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Food supplies in the flood-stricken area ______. We must act immediately before there’s nothing left.
A.have run outB.are running outC.have been run outD.are being run out
B
 本题考查动词时态和语态。分析题干语境可知,食品供应即将耗尽。run out为不及物动词短语,不能使用被动形式,由此可排除C和D两个选项。B选项为现在进行时态,可以表示将来,符合题意。因此,正确答案为B选项。
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