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  3. The trouble with such resources as coal, oil and gas_____that they are not renewable.

The trouble with such resources as coal, oil and gas_____that they are not renewable.

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问题 The trouble with such resources as coal, oil and gas_____that they are not renewable.
选项 A、has been
B、are
C、have been
D、is
答案D
解析 the trouble／problem with…意为“由……带来的问题；……存在的问题”。题中：the trouble为主语部分的中心词。
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