专四
A．impacting
B．impending
C．impeding
D．impeaching
【解析】动词的含义。impact“对……发生影响，撞击”；impend“即将发生，进行威胁”；impede“阻碍．阻止”：impeach“控告，告发”。根据句意“天要下雨了”．正确答案应是B。
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