9．It's safe to eat food after the"best before"date on the package，______ the food will no longer at its best．（　�。�
A．soB．butC．untilD．before

分析 在食品包裝袋上的"最佳日期"后吃食物是安全的，但是食物不再是"最佳的"．

解答 答案：B
解析：A因此；所以；B但是；C直到；D在…之前．根據(jù)前面的"在最佳日期前吃食物是安全的"與后面的"食物不再是最佳的"可知兩者之間的關(guān)系為"轉(zhuǎn)折"，故本題答案為B選項(xiàng)．其余選項(xiàng)均不符合題意．

點(diǎn)評(píng) 本題考查連詞辨析．做此類題目時(shí)一定要熟悉每個(gè)連詞的含義并結(jié)合用法與其在句中的成分來(lái)選擇合適的答案．

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