Hétong shàng xiě de míngmíngbáibái, nǐ zěnme néng làizhàng?
It is written clearly in the contract — how can you deny it?
Tips
grammar
明明白白 is formed by reduplicated pairs: 明明 (clearly/obviously) + 白白 (plainly/in vain). As an adverb it modifies verbs: 说得明明白白 (stated clearly). Both 明 and 白 individually mean 'clear/bright,' so the compound emphasizes absolute clarity.