Why the verb in present, if here says yesterday?

[Maris]

English Language Tests, Intermediate level

ESL/EFL Test #255 "Irregular Verbs Test (3)", question 9

I ......... into an old friend yesterday. I haven't seen her since middle school.

(a) runs
(b) run
(c) ran

English Language Tests, Intermediate level

ESL/EFL Test #255 "Irregular Verbs Test (3)", answer 9

I ran into an old friend yesterday. I haven't seen her since middle school.

Correct answer: (c) ran

Your answer was: incorrect
I run into an old friend yesterday. I haven't seen her since middle school.
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why the verb in present , if here says eysterday?

Maris

[Skrej]

Ran is past tense.

Run is present tense.
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Plan to be spontaneous tomorrow.
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