问题
选择题
He made a mistake, but then he took action to change the situation ________ it got worse.
A．until
B．when
C．before
D．because
答案
答案：C
题目分析: 句意：他犯了一个错误，但是之后在形式变坏之前他采取了行动去改变。until直到，when当……的时候， before在……之前，because因为；make a mistake犯错，take action采取行动；根据语境可知是在情况变的更糟糕之前采取行动，故选C