The boss praised the young man for his hard work,though he _
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答案B

be lacking in是习语,意为"缺乏",其后通常接experience,frankness,courage等抽象名词.选a是错误的,因为lack可用做名词和动词,但不用做形容词;选c是错误的,因为lack用做动词时,它是及物动词,其后不用介词(注:用做名词的lack后可接介词of);选d是错误的,因为没有be lacking of这个搭配.lack of+名词:The plants died for lack of water.