Put up your ______if you know the answer, please.

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Put up your ______if you know the answer, please.

Put up your ______if you know the answer, please.
Put up your ______if you know the answer, please.

Put up your ______if you know the answer, please.
hands
hand可数名词,前面没有a
put up hands
但这里有your,your hand可以代表你的一个手,所以这里用hand也可以
put up your hand
所以这里hand/hands都可以

hands
举手

hands

hand

hand/hands