2. 专升本
  3. Mary ______ at the bus stop for about an hour when Tom finally came and started to argue about what ______ before.

Mary ______ at the bus stop for about an hour when Tom finally came and started to argue about what ______ before.

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问题 Mary ______ at the bus stop for about an hour when Tom finally came and started to argue about what ______ before.
选项 A、waited, happened
B、have waited, has happened
C、had waited, was happened
D、had been waiting, had happened
答案D
解析 时态判断题。根据从句时态(came and started)和主句时间状语for about an hour可以推断第一空格为过去完成时态，排除A，B。再根据happened和came，started动作发生的先后顺序排除C。因此D为正确答案。句意：当汤姆来解释发生了什么事情时，玛丽已经在车站等了近一个小时了。
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