When he was young. he used to hard at his lessons.A．devote to workingB．devote himself to workC．be devoted to workD．be devoted to working 题目和参考答案——青夏教育精英家教网—

When he was young， he used to 　　　　 hard at his lessons.

A．devote to working	B．devote himself to work
C．be devoted to work	D．be devoted to working

试题分析：当他年轻的时候，他常常刻苦的学习功课。Used to do“过去常常”，devote oneself to doing或be devoted to doing致力于做…，所以选D。

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