open vs shut vs close

[Rich7]

Test No. incompl/inter-10 "Close/Shut", question 3

The detectives had no problems in solving the crimes as it was clearly an open and ......... case.

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

Test No. incompl/inter-10 "Close/Shut", answer 3

The detectives had no problems in solving the crimes as it was clearly an open and shut case.

Correct answer: (c) shut

Your answer was: incorrect
The detectives had no problems in solving the crimes as it was clearly an open and closed case.
_________________________

I've always wondered why open and not opened? and also why in heaven in this case is open and shut. if you see answer n5
it reads a" closed case. it doesn't add up....

Thanks

[Alan]

Here the words are used in an adjectival sense and in Number 5 clearly this is a verbal constuction to be closed. Consider the expression have an open mind.
_________________
English as a Second Language
You can read my ESL story Present Simple

[Rebecca]

Hi there,
I don't understand clearly about shut and close?
can you help me?
thanks

[Kathryn Wong]

i don't understand too, can someone explain to us?

[Alan]

Hi,

There are pairs of verbs like finish/end begin/start/ and this one 'shut and close' that have a similar meaning but are used sometimes for certain expressions. You would for example close and shut a door/a window/ but you would only 'close a discussion' and not shut it.

Alan
_________________
English as a Foreign Language
You can read my EFL story Phrasal Verbs/hold

[Luda]

Hello! I can't get meaning of "as it was clearly an open and shut case", can you explain, please. Thank You.

[Goodmahsa]

hi luda open and shut means a legal case or other matter that is easy to decide or solve