I saw your son ____ football on the playground when I ca Wap版

试题详情及答案解析: I saw your son ____ football on the playground when I called you yesterday.
A. to play B. played C. playing; 答案：C; 试题分析：句意：昨天当我给你打电话时，我看见你儿子在操场上踢足球。see sb doing sth看见某人正在做某事，故此处用现在分词playing，故选C。
考点：考查非谓语动词。