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

試題分析：句意：洪水地區(qū)的食品供應(yīng)即將耗盡，我們必須在沒(méi)有東西剩下前采取行動(dòng)。run out為不及物動(dòng)詞短語(yǔ)，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(lái)，符合題意。因此，正確答案為B選項(xiàng)。
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