A-A+
The world's oil supplyA. haven been gradually
问题详情
The world"s oil supply
A. haven been gradually being exhausted
B. is being gradually exhausted
C. is gradually exhausted
D. has gradually exhausted
参考答案
正确答案：B
10．答案为B 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。
