Ought to vs. should

[John]

Test No. incompl/inter-73 "Modal Medley", question 4

It's the right thing to do in this situation and it's my belief that you ......... to go.

(a) should
(b) might
(c) ought

Test No. incompl/inter-73 "Modal Medley", answer 4

It's the right thing to do in this situation and it's my belief that you ought to go.

Correct answer: (c) ought

Your answer was: incorrect
It's the right thing to do in this situation and it's my belief that you should to go.
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Hello!
Why "should" doesn't fit?
thank you

[Alan]

Should is NOT followed by a preposition.
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