This test is a culminating experience in your academic life.
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It can be (the culminating act). Culminating is the present
participle of the verb to culminate (conclude, end, result) and may
be a verb form, noun, or adjective.
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CULMINATING
* To reach the highest point or degree.
* To come to completion.
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Possible answers: leading up to, finally arriving at (both for
"culminating in")