If ______ in class, you will have to clean the classroom for a week as a punishment.A.caught sleepingB.caught to sleepC.catching sleepingD.to catch to sleep
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A解析这题考查if的省略句，词组是catch sb doing“抓住某人做”，if后面省略了you are，完整的句子是：if you are caught sleeping in class.句意是：如果你被抓住在课堂睡觉，你就打扫教室一个星期做为惩罚。选A。