________ in a difficult condition makes it possible for him to adapt to(适应)different kinds of weather．A.Being used to workingB.Used to workC.Being used to workD.Used to working
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A解析由于中间有makes，为谓语动词，所以前面只能是动名词作主语；另外只有be used to才能接动名词的形式(be used to doing sth．)，所以只能选A项。