If you smell gas in your house, you have to act immediately. you ( ) not delaycould might must will 答案是could 为什么

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If you smell gas in your house, you have to act immediately. you ( ) not delaycould might must will 答案是could 为什么
If you smell gas in your house, you have to act immediately. you ( ) not delay
could might must will 答案是could 为什么

If you smell gas in your house, you have to act immediately. you ( ) not delaycould might must will 答案是could 为什么
must