You can smoke here unless you leave a window open to let the smoke out.
unless改為if
unless改為if

【答案】unless改為if

【解答】

【點評】

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發布：2024/4/20 14:35:0組卷：3引用：1難度：0.6

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You can smoke here unless you leave a window open to let the smoke out. unless改為ifunless改為if