___ himself in carrying out an experiment, he can’t spare time to look after his children.A.OccupiedB.Having occupiedC.OccupyingD.Having been occupied
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C解析考查非谓语动词。句意：他忙于做一个实验，挤不出时间照看孩子。此处he与occupy存在逻辑主谓关系，故使用现在分词主动式，从而首先排除A和D两项；另外，此处谓语动作和分词动作应为同时发出，故排除B项（现在分词的完成式）。