摘要： The trouble with such resources as coal, oil and gas that they are not renewable. A. has been B. are C. have been D. is
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The trouble with such resources as coal, oil and gas ______ that they are not renewable.
A. was? ????????????? ???????? B. are?? ????????????? ????????????? ?? C. have been? ????????????? ?? D. is
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The trouble with such resources as coal, oil and gas ______ that they are not renewable.
A. was? ????????????? ???????? B. are?? ????????????? ????????????? ?? C. have been? ????????????? ?? D. is
查看习题详情和答案>>
The trouble with such resources as coal, oil and gas ______ that they are not renewable.
A. has been B. are C. have been D. is