用尽心机

tā yòng jìn xīn jī qù cāi nǎ yī gè nǚ ér huì dé dào dǐng hǎo de xí wèi

她用尽心机去猜哪一个女儿会得到顶好的席位。

She exerted much sagacity in conjecturing which of the two girls was likely to have the best place.