问题补充:
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:
A. until
B. when
(答案→)C. before
D. because
解析:
试题分析: 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