We need to get to the root of the problem______ we can solve it.
A. while B. after C. before D. as
We need to get to the root of the problem______ we can solve it.
A. while B. after C. before D. as
C
试题分析：句意：在我们解决问题之前，我们需要找到问题的根源。A. while当……时候，而；B. after在……之后； C. before 在……之前；D. as正如。根据句意可知选C。