题目内容
3．Tom didn't know___________________________．（ ）| A． | where were the Asian Games held | |
| B． | if the colour therapy works | |
| C． | who was Mary waiting for | |
| D． | how much it cost to fly to Tibet |
分析 汤姆不知道飞去西藏要花多少钱？
解答 答案：D．know后加宾语从句，引导词+陈述句语序，排除A，C．主句是一般过去时，从句用过去的时态，故排除B，故答案是D．
点评 本题旨在考查宾语从句这一语法，做这类题时，要从三方面考虑：一、选准连接词 二、连接词后紧跟从句的主语 三、若主句是过去时，从句要改为相对应的过去时．
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