have no choice but to
It's imperative. Chinese idiom, Pinyin is sh ì Z à IB ì x í ng, which means that things have to be done. From Dongpo Zhilin, Volume I.
The origin of Idioms
Su Shi's Dongpo Zhilin (Volume I) in Song Dynasty said, "if sun Wuling is the only one, it's imperative to do something, and there's no forgiveness if there's any offense."
Idiom usage
It's a predicate and an attribute. Chapter 66 of the chronicles of the states of the Eastern Zhou Dynasty: "it's imperative. How can it be predicted?"
have no choice but to
to see little of each other though living nearby - zhǐ chǐ tiān yá
act as if nothing were on one 's mind - ruò wú qí shì
achieve mastery through a comprehensive study of the subject - róng huì guàn tōng