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【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

【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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