The little girl is walking along the beach, happy and joyful, bending down to pick up a

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A. approximately
B. regularly
C. apparently
(答案→)D. occasionally
解析：D 考察副词辨析。句意：这个快乐的小女孩沿着海滨散步，不时地弯腰捡起美丽的备课。Approximately大约；regularly有规律地；apparently显然地；occasionally偶尔，间或；根据句意说明D正确。