Just consider that we use hardly one hundred-thousandth of the heat______in coal and that

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

A.it is

B.there is

C.as is

D.what is

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答案解析

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  • 正确答案:B
    thereisincoal是定语从句,省略了关系代词that,复原后应为:…weusehardlyonehundred—thousandthofthelleatthatthereisincoal。当定语从句是therebe句型时,关系代词that经常省去不用。题句如果选itis,那么与主句之间没有连接词;如果选whatis,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。