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Food supplies in the flood-stricken area          . We must act immediately before there’s left.
A.have run outB.are running outC.have been run outD.are being run out
B
此题考查时态。“在遭受洪水袭击的地区,食物供给快完了。我们必须赶在(食物)一无所剩之前立刻行动起来。”从句子后半句我们可以知道受灾灾区食物还有少许,还没有到山穷水尽的地步,只是所剩已经不多。所以我们选用现在进行时表示“即将”。另外,run out这个词组没有被动语态形式。故不选D。
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