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内容：
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1. He used to ________ his teaching when he was young.
A devote to B be devoted to
C devoting to D being devoted to
答案：B
解析：used to do 强调整过去习惯性的行为或状态，但是现在没有这种行为或状态了。因此，这个短语的内涵是今昔对比。
Our dog, Rex, used to sit outside our front gate and bark.
我们的狗雷克斯过去常蹲在大门外吠叫。
There used to be low and dirty houses.
那里曾是些矮而肮脏的房舍。
be devoted to专心致力于, 献(身), 贡献
He was still devoted to the study of chemistry.
他仍专心致力于化学研究。
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