這句話里面的to是不定式符號(hào),引導(dǎo)后置定語(yǔ)——這個(gè)教授幾乎不能找到充足理由,為他的辯論奠定基礎(chǔ)支持他的理論的理由.
which不是從句（沒(méi)有謂語(yǔ)）,which 指代前面的sufficient grounds ,和base on 句型套用在一起,on提前了which 指代前面的sufficient grounds ，which 是單純的代詞嗎，The professor can hardly find sufficient groundsto base his argumenton which in favor of the new theory。這種語(yǔ)序可以嗎不可以，這樣可以：The professor can hardly find sufficient groundsto base on his argumenton h in favor of the new theory。那Which不就沒(méi)了嘛，你這個(gè)句子不是定語(yǔ)從句，which只起指代作用，和這道題一樣it is unusual for a seller to be able to find a unique selling point or a competitive advantage with which to convince the customer .with the advantage of具備...的優(yōu)勢(shì)...advantage （with which to convince the customer ）只不過(guò)是咱們的這道題：base on把on提前了