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Food supplies in the flood-stricken area ______. We must act immediately before there’s nothing left.
A．have run outB．a(chǎn)re running outC．have been run outD．a(chǎn)re being run out
B
 本題考查動(dòng)詞時(shí)態(tài)和語態(tài)。分析題干語境可知，食品供應(yīng)即將耗盡。run out為不及物動(dòng)詞短語，不能使用被動(dòng)形式，由此可排除C和D兩個(gè)選項(xiàng)。B選項(xiàng)為現(xiàn)在進(jìn)行時(shí)態(tài)，可以表示將來，符合題意。因此，正確答案為B選項(xiàng)。
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