题目内容
15．Boys and girl，______learning and have fun!（ ）| A． | keep | B． | to keep | C． | keeping | D． | kept |
分析 男孩们和女孩们，继续学习玩得开心．
解答 答案：A．这里是祈使句，动词原形开头，故keep，故选A．
点评 祈使句一般没有主语，实际上是省略了主语"You"．句末用感叹号或句号，用降调朗读．肯定结构都以动词原形开头．例如：
Catch the ball!接球!（句子的意思是让"你"接球）
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