Question

【题目】I saw some students _______ on the playground while I was walking by it.

A. enjoy themselves B. enjoyed themselves C. enjoy themself D. enjoying themselves

Answer 1

【答案】D

【解析】试题分析：句意：当我走过操场时，我看到一些学生正在那里玩得很高兴。本题考查see sb doing sth(看到某人正在做某事)。故选D。