When he was young， he used to 　　　　 hard at his lessons.
A．devote to workingB．devote himself to work
C．be devoted to workD．be devoted to working
D

試題分析：當他年輕的時候，他常�？炭嗟膶W(xué)習(xí)功課。Used to do“過去常�！保琩evote oneself to doing或be devoted to doing致力于做…，所以選D。
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