【題目】You must read the instructions carefully_______ you take the medicine（藥）．

A. while B. after C. so D. before

【答案】D

【解析】句意：你必須服藥前要仔細(xì)閱讀說(shuō)明書。A. while正當(dāng)……的時(shí)候；B. after 在……之后；C. so因此；D. before在……之前。根據(jù)生活常識(shí)，先看說(shuō)明書后吃藥，故答案為D。

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