The world’s supplies of coal _______ gradually _______ up with the development of modern technology...
2023-02-10 16:51:57 182次 江苏省2010-2011学年高三英语一轮过关测试（7） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The world’s
supplies of coal _______ gradually _______ up with the development of modern
technology.
A. is;
used B. are
being; used C. has; used D. have been; using
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