【題目】You must read the instructions carefully_________ you take the medicine.

A.a(chǎn)s B.a(chǎn)fter C.while D.before

【答案】D

【解析】

試題分析:句意:服藥前你必須仔細(xì)閱讀說明書。before連詞,在……之前。所以選D。

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