they __to enter the building by the back door:however,the front door was locked.

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• They——to enter the building by the back door； howerve,the front door was locked.
• they __to enter the building by the back door:however,the front door was locked.
• The front door of the house______ ,so we had to enter through the back door.A .being painted B having just been painted C.to be painted D.was being painted
• They——to enter the building by the back door； howerve,the front door was locked.A.weren't supposed B.wouldn't be supposed C.were supposed D.would be supposed 为什么呢?为什么D错误?
• they __to enter the building by the back door:however,the front door was locked.A weren not supposed Bwould not be supposedCwere supposedDwould be supposed
• The front door of the house______ ,so we had to enter through the back door.
• They——to enter the building by the back door； howerve,the front door was locked.
• Are they---------(swim)in the river now?