The science teacher cleaned the bus(改为否定句) The science teacher _____ _____ the bus.

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The science teacher cleaned the bus(改为否定句) The science teacher _____ _____ the bus.

didn't clean

The science teacher didn't clean the bus.

didn`t clean

The science teacher cleaned the bus(改为否定句)
The science teacher __didn't___ __clean___ the bus.

The science teacher didn't clean the bus.