Teenagers have done everything they can---- think of to deal

Teenagers have done everything they can__finally__ think of to deal with the problem.
"孩子们已经做了他们最终能想到的一切,以解决这个问题."
Teenagers have done everything they can__probably_ think of to deal with the problem.
"孩子们已经做了他们可能想到的一切,以解决这个问题."
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再问： 其实是填possibly，不过你的应该也对