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Food supplies in the flood-stricken area _______. We must act immediately before there’s none left.
A.have run outB.are running out
C.have been run outD.are being run out
B

试题分析:句意:洪水地区的食品供应即将耗尽,我们必须在没有东西剩下前采取行动。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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