用英语回答when we put on them,they are full.but they are empty when we don't use them.接上what are they?

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• 用英语回答when we put on them,they are full.but they are empty when we don't use them.
• 用英语回答when we put on them,they are full.but they are empty when we don't use them.接上what are they?
• 选择题 All of them wondered when-------- A. they can set off B. can they set off C.to set off答案 给的是C，when to set off。谁能给我解释一下
• when we put on them,they are full.but they are empty when we dont use them.what are they?