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【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閱讀說明書。A. while正當……的時候;B. after 在……之后;C. so因此;D. before在……之前。根據(jù)生活常識,先看說明書后吃藥,故答案為D。

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