A.首先排除B,因为“put one's hand up”才是完整的说法,这里B少了“up”,因此被排除.其次,C是rise的过去式,虽然中文意思都是“上升,升高”,但是rise和raise（A的原型）有个很重要的差别,就是rise是不及物动词,只能用来表达某东西“自行升起,自行上升”,比如“The sun rises.”而人为的升起某物（比如此题中,是人为的举起了手）要用raise,后面才能直接跟名词,作为升高,升起这个动词的宾语.故,答案为A.
The boy ( )his hand to ask questions.
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