At that time I have no choice but _____(wait) for help.为什么用to wait

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AtthattimeIhavenochoicebut_____(wait)forhelp.为什么用towaitAtthattimeIhavenochoicebut_____(wait)forhelp.

At that time I have no choice but _____(wait) for help.为什么用to wait
At that time I have no choice but _____(wait) for help.为什么用to wait

At that time I have no choice but _____(wait) for help.为什么用to wait
在含介词but的句型中,but前有do,则but后的不定式不能带to;相反,but前若找不到do,则but后的不定式必定带to.
所以本题很明显要用to wait