【題目】Holiday is coming. Students are busy _______ their things in the suitcase.

A.pack upB.packing up

C.packing offD.pack into

【答案】B

【解析】

考查動詞短語辨析和固定用法。句意：假期即將來臨。學生們正忙著把東西裝進手提箱。A. pack up把…打包；B. packing up把…打包；C. packing off打發(fā)走（某人）；D. pack into擠進…里。be busy doing忙著做某事，該用法是固定用法，故選B。

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