题目内容
20．-It cost me 30yuan to get there．-Well，it was crazy of you to take a taxi ____ yon would come by bus as well．（ ）
| A． | when | B． | while | C． | unless | D． | because |
分析 ---花了我30元到那里．
---哦，你打车来也太疯狂了吧，既然你坐公交车也可以到．
解答 答案：A．根据选项 when当…时，正在这时，既然while当…时，尽管，然而（前后对比），unless除非…because因为，再结合句意，既然你坐公交车也可以到，何必如此疯狂花这么多钱呢，可知此处缺少了一个引导时间状语从句的连接词，故A正确
点评 本题考查时间状语从句的连接词，连词的辨析要根据上下文的语境进行，要特别注意一些连词的一词多义现象．如本题的when既然
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