Put the water into the kettle ,and then boil it ( ) about 10minutes.括号里应填什么?

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Put the water into the kettle ,and then boil it ( ) about 10minutes.括号里应填什么?
Put the water into the kettle ,and then boil it ( ) about 10minutes.括号里应填什么?

Put the water into the kettle ,and then boil it ( ) about 10minutes.括号里应填什么?
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