【题目】It is difficult for us to know the truth ______ we’ve actually looked into the case.
A. until B. after
C. since D. if
在线课程【答案】A
【解析】
考查时间状语从句。句意：在我们真正调查这个案件之前，我们很难知道真相。until“直到---为止”，在句中引导时间状语从句，故答案为A。
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