2. 外语
  3. A professor reported that he____________(已发现一种新方法帮助老人) improve their memories.

A professor reported that he____________(已发现一种新方法帮助老人) improve their memories.

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问题 A professor reported that he____________(已发现一种新方法帮助老人) improve their memories.
选项
答案A professor reported that he had discovered a method to help the old improve their memories．
解析 因discovered发生在reported之前，所以在report引导的宾语从句中谓语动词需用过去完成时态，即had discovered表达。
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大学英语四级

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