on three successive days?

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lillian25

Member
Chinese-Taiwan
hello, i was writing an essay and i was wondering which the following is correct.

1. i took the exams for three successive days.
2. i took the exams on three successive days.
3. i took the exams in three successive days.

i have googled these three sentences but i'm sure which one is correct.

thank you! :)
 
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