Meaning of ago

[Alfredo]

Test No. incompl/inter-84 "Simple Present (1)", question 4

But that was in the past. Things have changed because something happened to him exactly two years ..........

(a) ago
(b) gone
(c) passed
(d) over

Test No. incompl/inter-84 "Simple Present (1)", answer 4

But that was in the past. Things have changed because something happened to him exactly two years ago.

Correct answer: (a) ago
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meaning of ago

Alfredo

[Alan]

Here this means simply before.
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English as a Second Language
You can read my ESL story A day in the life of a stately home owner