himself in carrying out an experiment, he can’t spare time to look after his children.
A. Occupied
B. Having occupied
C. Occupying
D. Having been occupied
网友回答
A. Occupied
B. Having occupied
(答案→)C. Occupying
D. Having been occupied
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）。