【題目】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】

考查時間狀語從句。句意：在我們真正調(diào)查這個案件之前，我們很難知道真相。until“直到---為止”，在句中引導(dǎo)時間狀語從句，故答案為A。

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