The world’s supplies of petroleum ().

The world’s supplies of petroleum ().


A、

have gradually exhausted


B、

are being gradually exhausted


C、

are gradually exhausting


D、

 are gradually exhausted


【正确答案】:B
【题目解析】:

本题考察的是现在进行时的被动语态:石油正在逐渐地被消耗。exhaust是动词,消耗。主语是supplies 是复数,gradually 长期内逐渐地,慢慢地。


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