Difference between shut and close

[Jacheline]

Test No. incompl/inter-10 "Close/Shut", question 5

In view of the limited amount of information and evidence the case was now considered to be ..........

(a) closing
(b) closed
(c) shutting
(d) shut

Test No. incompl/inter-10 "Close/Shut", answer 5

In view of the limited amount of information and evidence the case was now considered to be closed.

Correct answer: (b) closed

Your answer was: incorrect
In view of the limited amount of information and evidence the case was now considered to be shut.
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Why shouldn't shut be used?

[Alan]

Shut would be used for doors/gates and so on suggesting a mechanical/literal process.
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English as a Second Language
You can read my ESL story Adverbs