问题
选择题
Hot _______ the night air was, we slept deeply because we were so tired after the long journey.
A．although
B．however
C．while
D．as
答案
答案：D
题目分析：考查让步状语从句。ABCD四个选项均可以引导让步状语从句，但although，while引导让步状语从句时不使用倒装，as引导让步状语从句时要使用倒装，其结构为：表语+as+主语+谓语。故选D。However引导让步状语从句时其结构为However+形容词/副词+主语+谓语，故不能入选。