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You must apply yourself_______ the study you have to take up.
A.onB.forC.toD.of
C
考查介词。On在某方面;for 为了;to到;of……的。句意:你必须让你自己投入到你不得不从事的学习中去。Apply oneself to sth专心致志于某事,故选C。
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