题目内容

We have to start at 7:15 tomorrow morning,           we will be late for the 9:40 plane.
A．orB．soC．ifD．before
A

试题分析：句意：明天早上七点我们必须开始，否则我们会误了我们9：40的飞机。A．or否则；B．so所以；C．if如果；    D．before在……以前。结合句意，故选A
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