2. 外语
  3. Edison failed ______ times before he succeeded in producing the first electric lamp.

Edison failed ______ times before he succeeded in producing the first electric lamp.

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问题 Edison failed ______ times before he succeeded in producing the first electric lamp.
选项 A、thousand
B、thousands
C、a thousand of
D、thousands of
答案D
解析 本题考查的是英语中的固定用法。thousands of times表示不特指的“成千上万次”。而a thousand times表示确切的“一千次”。根据句子意思，“爱迪生在成功发明第一个电灯泡之前经历了成千上万次的失败”，选项D)为正确答案。
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