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You must apply yourself_______ the study you have to take up.
A．onB．forC．toD．of
C
考查介詞。On在某方面；for 為了；to到；of……的。句意：你必須讓你自己投入到你不得不從事的學(xué)習(xí)中去。Apply oneself to sth專心致志于某事，故選C。
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