I stayed up all night ____ to figure out how to solve the tough problem.(try)

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I stayed up all night ____ to figure out how to solve the tough problem.(try)
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I stayed up all night ____ to figure out how to solve the tough problem.(try)
I stayed up all night ____ to figure out how to solve the tough problem.(try)

I stayed up all night ____ to figure out how to solve the tough problem.(try)
trying

trying

stay up all night do sth整夜未睡做某事
所以是try