The world's supplies of petroleum______. A.have been gradually being exhausted B.have gradually exhausted C.are gradually exhausted D.are being gradually exhausted
A.A.have B.have C.are D.are
【参考答案】
D 解析：句意：世界上的石油供直正在逐渐被耗尽。本题考查谓语动词的时态 现在进行时可以表示一种现在暂时性的动作(......