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

试题分析:句意:在洪水的重灾区供应的食物快用完了,在用完之前我们必须立刻采取措施。are running out表示将要用完,run out不能用被动形式。故排除BD;选项A表示已经用完,不符合语意,故选C。
点评:本题难度适中。动词时态及语态是高中阶段的重难点之一,高中要求掌握的时态需要考生牢记它们的用法,但是时态必须要结合一定的语境才能做出正确的判断。这里考生容易误选D。
即学即练: —Bob has gone to California.
——Oh, can you tell me when he        ?
A. has left    B. left    C. is leaving   D. would leave
解析:B。句意:—Bob已经去了加利福尼亚。——噢,你能告诉我他什么时候离开的?”Bob has gone to California,去的动作已经发生过,说明他离开的动作发生在过去,因此使用一般过去时。选B。
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