题目内容
13．I hate travelling by air__________ you usually have to wait for hours before the plane takes off．（ ）| A． | because | B． | though | C． | until | D． | unless |
分析 我讨厌坐飞机旅行，因为在飞机起飞之前你通常必须得等好几个小时．
解答 答案A because意为"因为"引导原因状语从句；though意为"即使，尽管"引导让步状语从句；until意为"直到才"引导条件状语从句；unless意为"除非，如果不"引导条件状语从句．根据"I hate travelling by air"以及"you usually have to wait for hours"可知空格后面介绍的是不喜欢的原因，所以要用because，故选A．
点评 首先要掌握这几个连词的意思及用法，然后结合具体的题意做出正确选择．
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