【題目】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】

考查連詞。A. since 因?yàn)椋捎冢?/span>B. before在……之前；C. although雖然，盡管；D. if如果。句意：有時在醫(yī)生準(zhǔn)確發(fā)現(xiàn)你的身體出了什么問題之前做檢查是必要的。根據(jù)前后句的關(guān)系，我們可以判斷出檢查應(yīng)在醫(yī)生診斷之前，故選B.

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