Just consider that we use hardly one hundred-thousandth of the heat______in coal and that could be extracted from it.

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问题 Just consider that we use hardly one hundred-thousandth of the heat______in coal and that could be extracted from it.

选项 A、it is
B、there is
C、as is
D、what is

答案B

解析 there is in coal是定语从句,省略了关系代词that,复原后应为:…we use hardlyone hundred—thousandth of the lleat that there is in coal。当定语从句是there be句型时,关系代词that经常省去不用。题句如果选it is,那么与主句之间没有连接词;如果选what is,what不需要先行词,而句中已给heat;as虽然是关系代词,但所引导的句子在语义上有"像……一样"的含义,不符合该句的意思,所以这几项均错。
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