B解析be lacking in是習(xí)語(yǔ),意為缺乏,其后通常接experience, frankness,courage等抽象名詞。選a是錯(cuò)誤的,因?yàn)閘ack可用做名詞和動(dòng)詞,但不用做形容詞;選c是錯(cuò)誤的,因?yàn)閘ack用做動(dòng)詞時(shí),它是及物動(dòng)詞,其后不用介詞(注:用做名詞的lack后可接介詞of);選d是錯(cuò)誤的,因?yàn)闆](méi)有be lacking of這個(gè)搭配。lack of+名詞: The plants died for lack of water.