Expression: "behind your back"

[Alder]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #68 "Back Again", question 6

She's the sort of person who can't bear being secretive and will never talk about you ......... your back.

(a) on
(b) over
(c) behind
(d) across

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #68 "Back Again", answer 6

She's the sort of person who can't bear being secretive and will never talk about you behind your back.

Correct answer: (c) behind

Your answer was: correct
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Hi
there seems to be some kind a contradiction in the phrase above as she can't be secretive and on the other hand she won't speak behind your back, ... does it make sense?
Thanks

Alder

[Alan]

Hi again,

This is the whole point - she doesn't like to talk about you behind your back precisely because she doesn't like being secretive. Wherever there is an idiom in a sentence I try in these tests to indicate its meaning in another part of the sentence.

Alan
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