单选题
The world's oil supply
A、
haven been gradually being exhausted
B、
is being gradually exhausted
C、
is gradually exhausted
D、
has gradually exhausted
【正确答案】
B
【答案解析】
世界石油供应量正在逐渐被耗尽。该题谓语动词应使用正在进行时的被动态，结构是am/is/are+being+过去分词。
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