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    【题目】Sometimes tests are needed _________ doctors discover exactly what's wrong with your body.

    A. since B. before

    C. although D. if

    【答案】B

    【解析】

    考查连词。A. since 因为，由于；B. before在……之前；C. although虽然，尽管；D. if如果。句意：有时在医生准确发现你的身体出了什么问题之前做检查是必要的。根据前后句的关系，我们可以判断出检查应在医生诊断之前，故选B.

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