4. It's safe to eat food after the "best before" date on the package,    the food will no longer at its best.

A. but          B. so

C. until    .   D. before

4.    A考查轉(zhuǎn)折連詞在具體語境中的運用。句意:食物在過了包裝上(標明）的"最佳"日期之后食用也是安全的，但卻不再是其最好的狀態(tài)了。 but但是；so因此;until直到……；before在……之前。本題中的前后兩個分句構(gòu)成轉(zhuǎn)折關(guān)系，故用but。

題目來源：2015全品語法快練高中英語新課標 > 訓(xùn)練9祈使句、并列句、感嘆句和慣用法

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