Question

“But this alone” won't do it what do you “mean this”?​

Answer 1

Explanation:

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Answer 2

but this alone won't do means that

(just for understanding) just that one example or commodity or thing is not enough you/they need more.

for example, you go to some place and they ask for your identity, you give them your school I'd card, they say 'this alone won't do' that is you need some other identity card too (like passport, etc.)