______, I always feel I want a few more days.
A．However long is a vacation B．However long a vacation is
C．However is a vacation longD．However a vacation is long
B

試題分析：考查however的用法：however可以引導(dǎo)讓步狀語(yǔ)從句，結(jié)構(gòu)是however+adj/adv+主謂, long是形容詞，用however，句意是：無(wú)論假期有多長(zhǎng)，我總是覺(jué)得想要更多。選B。
點(diǎn)評(píng)： however引導(dǎo)讓步狀語(yǔ)從句的用法主要記憶結(jié)構(gòu)：however+adj/adv+主謂，這是however="no" matter how。
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