问题
选择题
The trouble with resources as coal, oil and gas _____ that they are not renewable.[ ]
A. has been
B. is
C. have been
D. are
答案
答案：B
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The trouble with resources as coal, oil and gas _____ that they are not renewable.[ ]
A. has been
B. is
C. have been
D. are
答案：B