In1900,theenergyderivedfromburningpetroleumwasonlyfourpercent_____

In1900,theenergyderivedfromburningpetroleumwasonlyfourpercent______ofcoal.

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In1900,theenergyderivedfromburningpetroleumwasonlyfourpercent______ofcoal.

A、that
B、this
C、what
D、which

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