The same vs. alike?

[Alisa]

Test No. incompl/inter-40 "Do you mind?", question 6

It's clear as they say that great minds think ......... because we have both come to exactly the same conclusion.

(a) same
(b) similar
(c) like
(d) alike

Test No. incompl/inter-40 "Do you mind?", answer 6

It's clear as they say that great minds think alike because we have both come to exactly the same conclusion.

Correct answer: (d) alike

Your answer was: incorrect
It's clear as they say that great minds think same because we have both come to exactly the same conclusion.
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Hello moderators! Why word "same" doesn't fit in here?

[Alan]

The expession is THE same.
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English as a Second Language
You can read my ESL story Womens' Day

[sendiony]

why not can`t i say SIMILAR???
or should it be SIMILARY here???

[Mister Micawber]

.
Similarly would work grammatically, but the idiomatic axiom is Great minds think alike.
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber