问题
选择题
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
答案：B
used to 接动词原形表示”过去常常”；”致力于”应该是devote one-selt to 或be devoted to…，所以答案为B。
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