Final answer:
The correct conjunction to complete the sentence is 'pero', which means 'but' in English.
Step-by-step explanation:
The correct conjunction to complete the sentence is pero, which means 'but' in English.
So the sentence will be:
'La tintoreria está abierta, pero hoy no tengo tiempo para dejar la ropa. La llevaré mañana.'
Learn more about Conjunctions in Spanish