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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,在发生洪水的灾区食品供应即将用完。我们必须在全部用完之前采取行动。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。A选项为现在完成时,原题中想要表达将要用完,还没有用完,所以不合题意,B选项为现在进行时态,可以表示将来,符合题意,故选B。
点评:解答这类题时要理解题干意思,准确判断出时态。另外根据词组本身排除某些选项。一般来说,只有及物动词(词组)才有被动语态。
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