The output of the gold mine is now four times _____ it was before liberation.
A.that
B.what
C.which
D.than
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B解析考查倍数表达方式。倍数表达方式有 A is four time as big as B=A is four times the size of B=A is three times bigger than B=A is four times what B is.对照结构，选择B