Find the synonym of the underlined word.
Unconscious learning is now considered to be of questionable worth.

Invaluable

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Dubious

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Superficial

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Secondary

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Primary

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Solution

The correct option is B Dubious
'Questionable' means likely to be dishonourable or morally suspect.
"his questionable financial deals"
In this context, "Unconscious learning is now considered to be of questionable worth, "questionable' means dubious or suspicious. Hence, option B is correct and the other options are not because they do not provide the appropriate information.

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