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Please correct the following text.

Do you offer this service on your every center?

No, this service is only offered on selected/selective centers.
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Hi Jackson,

Is this service offered / provided at all of your service centers?

No, it's only offered at selected centers.

("Selective" is any process which chooses. "Selected" are the ones which get chosen.)

Best wishes, - A.
Do you offer this service on your every center at all [of] your centers?

The word "of" is optional.

No, this service is only offered on at selected centers.

Some purists would insist on No, this service is offered only at selected centers. This is because in "only offered" the word "only" strictly applies to "offered" -- in other words, nothing else is done to the service except to offer it, which is not at all what you mean. Many people would take the view that it's perfectly obvious what "only offered at selected centers" is intended to mean, so there's no problem.
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Thank you, Avangi and Mr Wordy.
Mr Wordy said:

>Some purists would insist on No, this service is offered only at selected centers.

I like that, seems more logical to meEmotion: smile
The purists are dead! Long live the purists!

offered only at A "offered" modifies "A" - agreed

only offered at A "only" modifies "offered" - agreed

only offered at A = "that's all they do at A" - not agreed It really means, "They only offer to fix it; they don't really fix it. They also offer other services."

Offered only at A is the better choice. - agreed
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Avangi
only offered at A = "that's all they do at A" - not agreed It really means, "They only offer to fix it; they don't really fix it. They also offer other services."

I'm not sure if your comment was solely a response to what I wrote, but just to clarify matters, I wrote: "nothing else is done to the service except to offer it", not "nothing else is done at the centers". "Nothing else is done to the service" includes the fact that they don't carry out the service, as well as the fact that they don't do innumerable other things with the service. So in that sense we're agreeing. However, "This service is only offered at selected centers" to me says nothing one way or the other about whether they offer other services or do any other things at the selected centers.
Thanks, Mr. Wordy, for pointing out my error. You're absolutely right. (I've got to quit posting when I'm tired.) We're in complete agreement re everything you've said on this thread. - A.

(Well, assuming that you agree with everything you've said)