'I couldn't agree with you more' = 'I agree with you completely'

[Phoboe]

English Language Tests, Intermediate level

ESL/EFL Test #60 "Cliches", question 2

........., I couldn't agree with you more.

(a) Totally
(b) Clearly
(c) Finally
(d) Absolutely

English Language Tests, Intermediate level

ESL/EFL Test #60 "Cliches", answer 2

Absolutely, I couldn't agree with you more.

Correct answer: (d) Absolutely
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Please explain what this mean?

Phoboe

[Mister Micawber]

.
'I couldn't agree with you more' = I agree with you completely (It is impossible for me to agree more, because I already agree 100%).
.
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Native English teacher at Mister Micawber's

[Tarot]

Hi, there is no chance to use a possibility a) totally? I was thinking I could also use this option...

[Beeesneees]

I can imagine that option being used too, Tarot. However, of the four (d) is by far the best answer. You should always choose the best answer rather than one that seems to fit.
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Cheers m' dears!

[Tarot]

Ok, then. I try to keep it in my mind :). However, I will be probably asking soon enough again :). Thanks for prompt reply.