______, I always feel I want a few more days.A.However long is a vacation B.However long a vacation isC.However is a vacation longD.However a vacation is long
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B解析试题分析：考查however的用法：however可以引导让步状语从句，结构是however+adj/adv+主谓, long是形容词，用however，句意是：无论假期有多长，我总是觉得想要更多。选B。考点：考查however的用法 点评： however引导让步状语从句的用法主要记忆结构：however+adj/adv+主谓，这是however=no matter how。