He is very good at carpentering, though .A. is very youngB. very youngC. hevery youngD. h

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A. is very young
(答案→)B. very young
C. hevery young
D. he was very young
解析：考察状语从句的省略。本句在though后面省略了he is；当状语从句的主语和主句主语一致，且状语从句中含有be动词的时候，可以把状语从句的主语和be动词一起省略。句意：他很擅长于木匠手艺，尽管他很年轻。故B正确。