【题目】Take the underground at Brown Street Station. (改为否定句)
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【答案】Don’t take the underground at Brown Street Station.
【解析】
原句句意：在布朗大街站乘地铁。该句是祈使句，否定句在句首加don't，首字母大写，故答案为Don't take teh under ground at Brown Street Station.